Canon 70-200mm F2.8 L Loose Focus Body

[camden799]

      Hi everyone, I have a 70-200mm F2.8 L that I recently bought used for $500. It was claimed great condition. Owner I bought it from seemed oblivious to the amount of movement in the focus barrel. I know there are three internal screws that must be loose, but with diving in I realized a screw on the inside is stripped limiting no way to get the focus barrel screws tight. I was wondering if dabbing a few drops of super glue would be a terrible idea...? I am outdoors a lot and do not want it to fall apart. Right now using a little duct tape and that is holding it very nicely, but not as much as I think some glue could. I am college student so do not really have the money to send it away for professional service. I just would like to hear everyone's two sense. I will leave a picture to show which part.

Thanks, Camden!The orange part is circle is what has the movement.

[Tronhard]

Hi and welcome to the forum:

Personally, I would prefer not to put something like super glue inside the lens.  If only the screw is stripped and not the thread into which it sits, then  you can order a couple of spares from Canon.  To do so, please call 1-866-481-2569. The hours of operation are 9:00 A.M. to 8:00 P.M. EST from Monday to Friday. When calling, speak the term "order parts" when the speech routing system asks the reason for your call. You will immediately be routed to the Parts Desk for assistance.

That said, I would be wondering why the screw is stripped to begin with - obviously the lens has been opened and disassembled, is it otherwise working reliably?

[camden799]

I may have stripped them attempting to get into it without the use of JIS screwdriver. The lens works flawlessly besides that with the glass being perfect. I am more concerned on how to remove the stripped screw from inside the camera to even replace it... 

[Tronhard]

I suggest you take the lens to a jeweler, and their techs will be likely to be able to do that.  You are not equipped or skilled at this, and you can really screw up your lens with the wrong actions.  Aligning the lens elements is a precise science and art, so I hope you have not compromised the focus or sharpness of the optics.