Trob inou, it is not so important. In my case the part is about 6 mm thick.

@ Ok, many thanks :)

There is wobble between the green body of the drill and the pillar - this video addresses that.

Odd that your diameter is smaller. The ring must have an opening for the gear shaft to fit. However, one could probably make it in, for example, aluminum or bronze.

@ Very strange, and its only a few year old. Maybe never models hav smaller shaft(cheaper).Yes you need to hav an opening for the gear shaft but it does not need to be fully open like the original design. You can have a "bridge" covering the opening just behind the gear shaft location, thus it would be stiffer(little difficult to explain). Bronze would be great, considering sourcing a suitable bushing that would then modify with a plate to fit. Most play is in the chuck(will get a new better one next week) and the gear box needle bearing. Changed all chuck related bearings yesterday....but would be enough to just change the small needle bearing on top of it, the main 6002 is not that bad.

Of course you can have a “bridge”. I would be nice to hear about new needle bearings :-)

@ You can use 2 bearings of this type: 8X12X3.5mm MR128 ZZ. No aliexpress......source Japanese or other quality bearings. There is a French video on KZfaq how to change bearings, its not a 10min job:) I removed the needle bearing with modeling clay and a 8mm shaft.

In my case it is SolidWorks, but Sketchup is another good program.

David Sedláček what do you mean with "shaft backlash"?

@ there are three types of "wobbling" (backlash). - First is what you've fixed with your insert, - second is in "z-axis" when you lock the nut at the back of the drill (activates the spring mechanism) - and third is in the chuck itself = the chuck is mounted on a shaft. The shaft is held by two bearings - at the top and the bottom of the shaft. The bottom one is OKish, but the top one is totally loose. See this vid: kzfaq.info/get/bejne/Y6mZgpCAlrTTl5s.html Cheers David

@ Ok then I understand. We must not forget that it is a Bosch green :-)

Have you managed so far?

@ The chuck of this machine is really crap. The worst think is that it does not seem to be changeable. I tried to replace mine but it seems to be welded to the shaft or glued with some sort of glue which is impossible to counteract. Perhaps I am just too much of a chicken, but I feel that I have tried with high force than I feel comfortable with and feel that if I'd use more force I'd brake it.

Good question. It's still better than before, but has started to wobble a bit again. I'm going to try again with a stiffer plastic.

@ Good idea. I ordered two custom aluminum rings: one to be placed where you added your insert and the other one at the top, instead of a black plastic cover of the metal body. I will drill them so that they can be screwed to the body and will make 15 mm gap for the rack bar. I hope it will be tight enough and maybe two rings up and down will make it really stable.

@@tetesefi What is the result?

My favorite is maybe NOVA Viking 16" DVR Benchtop, if you can find it. What did you get?

You can find the cad file here: grabcad.com/library/part-to-reduce-wobbling-head-on-bosch-pbd-40-1

grabcad.com/library/part-to-reduce-wobbling-head-on-bosch-pbd-40-1

Tahnks @ your very kind.

Chuck is changeable

@@epedja I know now, and also managed to change mine. In the Russian video I linked to it looks so easy but it is NOT that easy, so I thought it was welded, but it was not. Here is my video about the changing of chuck: kzfaq.info/get/bejne/pKmhidKSrLyvaJs.html

@@AdaptingCamera Funny thing. Your video is one I learned from that it can be replaced and that in fact I should replace as soon as I find this better chuck :)

@@epedja I am glad it helped you and others.

Did you invent anything regarding these ball bearings pushing the rail from the side? I just ordered two aluminum rings but I just want to make 15 mm gap for the rail.