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Perfect response. I drilled a hole at 15/16" radius and inserted a tight-fitting nail which did the job. Was then able to unscrew the cap. Thanks for the most helpful and thorough reply.

I have a '77 R100/7 which has been untouched in my garage for many years. The key works in the ignition and frame lock, but wouldn't turn in the gas cap, which would only rotate about 20 degrees. I have drilled out the cylinder and can see what appear to be the threads on the inside of the cap (abou...