Screws with destroyed head

This time I disassembled a 70-200 f2.8. better to say: I wanted to, because one of the two screws on the zoom barrel has been destroyed immediately after the first trial. The material is two soft, and the screw is glued from the factory.


In such cases You can do 2 things: to drill out the screw – difficult and after this You will have the threaded (steel) part stucked  in the metal base (mainly aluminium alloy) – or You can try to make in it a groove for a bigger screwdriver.

Before this operation, You have to cover the lens and the housing – the small grinding machine produces metal particles – very dangerous for the lens.

70_200_0005  IMG_5970

It’s not very beautiful – but it works!


About canonrepair

Ruzsa János. Amatőr fotós, Canon DSLR váz. Amateur photographer. Canon DSLR user.
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1 Response to Screws with destroyed head

  1. jkenny23 says:

    I had to extract a glued screw recently from Canon EF-S 55-250mm IS STM lens. I used a screw extractor set designed for bigger screws, it was rough work but it did get the screw out. I am not sure why Canon would use such permanent thread lock, I guess these lenses are not designed to be serviced at all?

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