If you look at the heavy duty trolley upside down you can see inside the wheels between the center structure and the wheel is a spacer / bearing that is about 1/8 or 3/16 below the height of the center structure. I milled down to that but was probably a bit more than needed. Another option would be to grind some of the bolt head down and mill less off the trolley.

Sounds like a solid design for sure. When you say each corner - are you planning on all four corners? If so then certainly don’t think load will be an issue. When building like mine on just two rails you do end up will load on the trolleys from the lever effect of weight on the platform pulling away from wall even though supported from winch vertically. Be curious to see your build as sounds promising for sure. Good luck!

@@Joemx82 yeah all 4 corners will have rails and rollers, winch will be mounted in the middle of the top of the rails with triple up lines on pulleys to the cage. on the downstairs side the elevator will be enclosed in a closet basically. ill for sure do a vid when its in construction and done. im welding up a 3/4" top 4X8 welding table now.

@@Texas_Radical I'd love to see how this worked for you. Can you send me a video or photos? I'm trying to use nylon wheels from heavy duty casters to quiet and smooth the ride.

@@kellyjosephcourtreporter8822 yeah when i get it done ill post vids. im really thinking rollerblade wheels. (there should be no load on the wheels, they will just act as a guide) the way im thinking about doing it is a L channel on each corner going up and down and a wheel on each side of each corner top and bottom with a adjuster to tighten it so there is no slack for the cage to bounce around in the shaft. then a small winch with a triple pulley on top and bottom to reduce the working load. I may also have to shim the L channel due to nothing is square in this house, right now I am insulating the garage and just finished drywall on the last room upstairs.

@@Texas_Radical I hope to see a video of your build. I have a similar plan in mind for my garage attic space. I have a stairwell leading up to the attic that I would like to convert into an elevator shaft, using the plans that you have in mind. I would try to engineer a motor and pulley system that attaches to all four corners of the elevator platform via cable to uniformly lift it. And I would have the whole lifting system held up by the 4 corner posts so that no weight bearing is placed on the walls or ceiling joists of my garage (basically a cage within a cage). I think the challenge I would have is deciding what size components I would need to safely lift 500 to 750 pounds (e.g. winch HP, cable and pulley sizes, bolts and screws, for example).

Link below - under my other videos too - probably not the best video but another one I took of the idea - happy to give more details so let me know if you want something more in depth. kzfaq.info/get/bejne/mcuco8dlqdXIgGQ.html

@@Joemx82 Thanks for the quick response Looked at the video. Nice work

RHKING 4 Wheel Trolley Assembly Trolley Roller Stable Welding 2PCS for 1-5/8" Wide and All 1-5/8" or Taller Strut Channel www.amazon.com/dp/B08RCRBG7K/ref=cm_sw_r_cp_api_glt_fabc_X8SM021XM6S4RX8R5YJX

Those are them on Amazon but you can google 1 5/8 heavy duty trolly wheels and might find a better deal. I recall paying around that price though.

www.amazon.com/dp/B08RCRBG7K/ref=cm_sw_r_cp_api_glt_fabc_X8SM021XM6S4RX8R5YJX