What part caused the damage? The backing plate or the adaptor? What I meant earlier about not product failure in the sense that nothing that the company manufactured broke. That adaptor is used for people with a rotary BP that wants to use it with a PC aswell. I`m assuimg that the adaptor needs to be tightened to the PC with the given tool from Porter Cable and then have the backing plate tightened into that. I think that a Backing plate that is made for the PC would be ideal for this kit which you wouldnt have had to worry about this problem.
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