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Hi JA,
yes, the idea should work.. it should be OK for smaller dents.. just as mine.
Now you gave me a prompt to make a tool suitable for more serious damage (deeper dents.. I have Canon 300 mm lens with similar damage), I will make my tool to be adjustable (one of the bearings should be mounted on movable plate, to adjust for diameter of the damaged tube). Also, instead of just middle bearing, I think I should have a ferrule with grooves to accommodate and repair the existing thread on the lens.
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