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Old Jul 15, 2013, 5:04 PM   #1
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Default Help with damaged screws in canon 18-200mm lens.

I have a canon 18-200mm EFS that, out of the blue, stopped zooming.

A brief background story: 3 months ago, it suddenly wouldn't zoom back to it's widest angle. When I tip the lens around, I could hear that something was loosen, I thought it was a piece of glass loose. Then last week, without doing anything different, the zooming was so stiff I couldn't manage to zoom at all. However, I was out on a session, and had to use a little force to turn it to 50mm focal length.

Just the other day, I took it apart. I managed to take off the end cap where it goes into the camera, the metal case, the circuit board, as well as the connectors. After that I came upon some screws on the outer black rim that were extremely difficult to take out, and they were also very easily chipped, being as careful as possible to slowly turn, but it still chipped.

I tried all that I could think of: putting a rubber band over the screws, slicing the screws with an xacto knife to make new grips but to no avail, tried using the star screw drivers. None of them did anything. One option that I have left is to use a dremel tool to help slice the screw top so I can turn.

My concern is that, though it will definitely make a slit on the screw top, it will also damage the body, and I don't want that to happen. For those who have taken apart lenses before, do you have any suggestions for me? or do I have no choice but to use the dremel?

With this lenses out of service, I have also been out of service. Any suggestions is welcomed. Thanks.
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Old Jul 15, 2013, 5:23 PM   #2
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The only thing I could suggest is that if the part that is being held by the screws could be lifted off it the screw heads were gone, you could use the Dremel to drill out the screw heads, and once the part was off, grip the screw shanks with pliers and turn them. Of course, you would need replacement screws.

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Old Jul 15, 2013, 8:45 PM   #3
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I don't think the part will come off with the screw heads gone. The screws are being screwed on the layer below pretty good. and if the heads are gone, it would be impossible to take the screws out then, without destroying the two layers... i think.
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