Help!!!!! I have a screw stripped on my 300 2.8 IS

Please help!!!

My female receiving thread is stripped!!

It is the screw and a ring where the screw goes through and threads into the lens. These two parts mount on the lens and the tripod collar mounts to it. The receiving end of the screw is stripped. Has anyone super glued this screw in? I’m worried about the abuse due to the tripod collar spins on it.

As a mechanical engineer I'm always conscious of the ramifications of a decision and for that reason I would not use super glue. There may be a day when you want to get that screw out and "yes" 90% of the time you may be able to break that bond, but what if you pop the head off the screw?

I would get some fine steel wool, and just get barely a few strands into the hole, then put some clear nail polish on the threads of the screw, insert it and tighten. But use caution, don't over tighten.

Steel wool and nail polish.. Yikes. I prefer JB Weld Epoxy, then re-drill and re-tap. Good as new.

gjl711 wrote in post #19560399
Steel wool and nail polish.. Yikes. I prefer JB Weld Epoxy, then re-drill and re-tap. Good as new.

I agree but the OP was asking about superglue so I’m inclined to think he wanted to proceed without much thought. Another issue might be a tap drill and tap for the small screws used on a lens. Then as well these are likely JIS screws which are prone to stripping the head when a Phillips is used. A common size for Canon lenses is M1.8x0.35. That is a screw 1.8mm nominal diameter with a 0.35 mm pitch. The screw head diameter is 3 mm, about 1/8 inch. The thread dimensions are at the bottom line of the attached table.

By the way I’ve used the steel wool trick for years (1965), probably dating to a time when JB Weld or “similar” didn’t exist. And some of that time was in the middle of an ocean where there wasn’t any hardware stores.

Super glue would be the worst option It would hold the screw in the hole but the screw would not be applying any pressure to the two surfaces being held together.

I have the impression that is a shoulder bolt that serves as an axle for the roller. It is not clamping parts together. However, it needs to be secure in the hole!