I had actually watched this video a year ago right before I bought the EQM35pro, it was what offered me hope of mechanical upgrade to a pretty tidy mount per $ to the quality. So a year in nearly, and due to the excessive astronomy addiction of additions and upgrades to the weight I find myself teetering near limits and had to backtrack. And then the mount went wonky. and after the standard rebuild, grease and backlash battle (very easy, very doable for anyone inclined when using this video) I found myself ordering roller bearings last night to the specs you've posted for versions 1 and 2 except the ball bearings which are next. I did get myself down to 57-80 rms with standard tweaks, but they never really cured the dec stiffness completely even at peak tweak. So, Much appreciated my good man! I look forward to seeing if anything better can come from this replacement. (p.s. I actually found two(2) fibre washers in my dec bottom which was either a mistake or compensation so...bearings it is. many thanks.

Dear Petter, Thanks a lot for this nice video with all this great details and tips. I have just completed the tasks for the first time on my EQM-35 Pro bought in Feb-2021. Which worked fine for me up to beginning of this year when I tried to use it with PHD2 for guiding instead of my MGEN3 and could not get any calibration on DEC completed. I looked more in detail and found a lot of backlash and stiffness on the DEC axis while the RA seemed still to be ok but also with some Backlash. When I discovered your Youyube video I decided to do the maintence / tunung myself as none of the astronomy dealer here in France does want to mess with an EQM-35 Pro. I followed precisly your video having boght before the parts on your list. The only two things I found difficult was the fact that for my mount I could not implement option 2 as they must have changed the design of the parts slighty and with a large beering I could not find on both sides plane surfaces and had no room to put two washers on each side of the bearing. I went for option 1 and rinded the inside of the bearing a bit to get it passing over the axe without the need of heating each time. On DEC I also did not find yet a solution to replace all the caroon washers and I had to leave the last washer before screwing the nut on the axe fianly because otherwise there was not enough room to get the nut properly tightened without loosening when turning the axe with the cludge dis-engaged. I have done some photos ant put it on my facebook account and want to thank you again and encourage all other EQM-35 users too consider this maintannce / tune. I saw another video where only the de-tightening of the RA and DEC axe screws were described plus the procedure to loosen/tighten the RA/DEC adjystment screws. The guy said all other things will not lead to much more improvment, but having done all now OI think this is not true. In particular the cleaning of all the old cheap grase and replacing most of the bearings leads in my mind for a significant improvment that both axes tur smoothly in all positions. I tried first just to do without cleaning and flet a lot of irregular resistances in both axes when trying to turn and adjsust the screws. I was not possible to find an adjustment settings that the mount axes had neither a backklash nor a gripping point on a 360 Deg turn. This changed when I had done the full procedure you described in your video and I think this is well worth as it minimizes irregularities. Thanks again and clear skies which I am waiting for to quantify the success of my efforts with a PHD2 guide graph. But I am quied confident that PHD2 will now calibrate and guide my EQM-35Pro and even better as the MGEN3 did.

Peter thanks for your inspiring video, greetings from Athens 👍

Brilliant stuff mate, this vid gave me an interesting idea ;)

Thanks for great tutorial. Just a side note, worm gears bearing are 628-6-ZZ-SKF (if SKF is preferred), I have EQM-35 PRO but same ball bearing size.

Thank you for this very detailed guide!

This is awesome, I have Arsenal EQ3-2, so now i know what to do)

I have a eq3 pro, was literally thinking of doing this with thrust bearings (I’m an engineer) to see if it would help 👍🏼 then this pops up…awesome work sir 👍🏼 i get 0.7 guiding as it is (I’ve used good oil in places) but I’ve always wondered if I could get it lower 👍🏼 I’m gonna try this 👍🏼 nice one dude 👍🏼

DId the upgrade with excellent results in both RA and DEC, DEC seems to be around 0.5-0.6 now and RA around 0.8 but also have some sudden spikes every now and then.. meaning i have to make RA movement more smooth or check for stiffnes! thanks once again for your video :)

IMHO: I think there are no need to use bearings between body (parts with brakes) and metal cylinders, because during guiding - they are blocked with brakes. Bearings just need between metal cylinder and moving parts. Sorry for my english, I hope you understand me.

Good video

Thinking of getting one of these mounts. I know you have made mods to yours but considering the price it looks pretty well designed

Super nice video! Thank you for adding all the parts and instructions. I just finished this myself, and indeed the mount feels so much smoother than before. For my particular mount, there was so much play before, that it is now incomparably better. I do have one lingering question: on the Dec axis, if I push gently on my telescope, I can feel some small wobble. When I had the mount apart, as you did, I removed the play entirely in the worm gear assembly. I have repeated this several times, and it seems no amount of gear adjustment removes the wobble, even when overtightening it intentionally. I am wondering if this is intrinsic to the design, and maybe the motor mount bracket is flexing a little bit or the gears just have an imperfect mesh. Do you have the same problem? I'm not sure if it is something that will really effect guiding performance or not.

I have an old CG-4, one of those without the saddle plate. I once cleaned it, but now I have to do it all again and try to replace the washers with bearings. Not sure if axles diameters are the same.

Greetings from San Diego! My EQM-35 Pro has started failing PHD Calibration in DEC. I found your video while looking for help. Thanks to you, I have bearings on order, and a disassembled mount in my future! :-) After watching your video, I feel confident that I can do a similar rebuild. The only question I have is "What are bearings part numbers (or size/shape) you recommend for the worm gear? Your "ball bearings" table entry shows 6/13/5, but no part number, so I am not exactly sure what to order. If you could clarify that, I would be much obliged. Thanks again for taking the time to share such great and practical knowledge with the community.

Many thanks for this tutorial! In you case what weight/setup did you had when guiding at 0.7/0.5 arcsec/pix? I'm wandering if with this improvements with manage to increase the useful payload if the mount for astrophotography? Best regards and thanks again.

Really nice video, I used it to tune my EQM-35. I had some crazy binding on the RA axis, also mentioned by others in the comments, so I had to grease the RA clutch shaft, but I think its fine :) Mind linking to the swedish webshop you used? I am in Denmark, so I think shipping should be cheap :)

hi petter i have sat and watched your very informative video do you know if the eq 3 and the eq 3/2 are the same internal dimensions many thanks for any advice

Hello Petter, I did some research and found what could be the correct bearing to replace the AXK2542 and not require any grinding. It's a TC1625, 1" bore (25.4mm) and 1 9/16" outer dia. (40mm). I just ordered some from Amazon Canada, should be here next week. I'll confirm they work without modification when I receive them. Paul

morning Petter, was wondering what is the heaviest telescope you can image with on your eq3? Thank you.

at about 14mins in it looks like your tightening the grub screw when you said you were loosening. Is that correct?

Peter, what is your washer size (or part number) that you used at 44:15? So you first used a washer, after this the rubber part then a bearing and then your washer at the end?

Hei, Petter - thanks for a great how-to video. I'll tune my 3-2 for sure after seeing this. One question, though: Did you finally find a suitable thrust needle roller for that last red washer-type "bearing"?

i use to have a eq5 and did the hypertune on that , could the red fibre washers be replaced with teflon washers( the 2 you cant get the metal bearings )

Thank you for your sharing, but I still want to know the size of the three bearings used on the RA axis.（20:50, 22:01, 24:51）🙃

Great instructions and explaining but sadly i cant seem to get the dec backlash fixed. Ive been fiddling around with the screws that adjust the wormgear(including the small grub screw in the middle), and if i want to minimize the backlash, the wormgear wont spin smoothly(with the mount put together). If i want the wormgear to spin smoothly the backlash will be huge. Cant seem to find the problem. Any help would pe much appreciated

Bra video! Vad kostade alla lager när du köpte? Ser dyrt ut nu när jag kollade 😅

Where did you bought them, I can't see to find the sizes you describe

amazing job and a great upgrade to the mount! Would you consider adding belt drives? I would give that a try! I wonder if this shop could send it the parts to Estonia.. Could you share their website please?

Hi Peter do you think that after this upgrade the mount can handle 130 newtonian from skywatcher

Can the mount handle a 6in dob 10lbs with hyper tune?

I want to apply lube on eqm 35 mount can i follow this tut for tearing down the mount

las arandelas rojas q trae de serie no se venden ??

I would like to apologize but I doubt total RMS error of 0.46" per axis. It is hardly possible even with Eq6. May I ask for exact guiding setup parameters ([camera type, guiding scope type] or [camera pixel size and guiding scope focal length])? I can see in your Phd2 screenshot ration 0.07px/0.46" what is 1px/6.6"... It is possible but you would had to use relatively uncommon very short guiding scope or guiding camera with relatively big pixels. Usual camera parameters are about 1px/3.5"and focal lenght about 200mm. Total error 0.7" would be more believable (everything under 1" is great and even 1.5" is well usable) and still deeply under seeing conditions limits. It is miracle if you have really RMS error under 0.5". Thank you for the great video.

how does the white grease perform in the cold? does it get stiff?

I have eqm35pro , based on eq3-2....do you think all parts Will fit in eqm35pro?

Du är svensk 😂😂😂

Люфт на червяке регулировать не умеет и делает всё неправильно .

I can't figure out why people buy shit that needs to be fixed right out of the box. Makes no sense.

Do you have Instagram or twitter ? There’s some weird dec problem i have “ I didn’t hyper mod it “ The problem effect the RMS error it went from 1” to 20” ARC second