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I have an oldie-but-goodie Porter Cable model 368-1 Type 2. I have tightened the arbor bolt as tight as I possible can (holding the inner nut with a wrench) but when I use the saw, the blade loosens up. I know the bolt is not too long, because I can get it to bottom out without the blade. I have attached pics of the saw and the arbor parts that I am using. Hopefully they are the correct ones. Is there some friction material I should be adding between the copper washer and the blade? Help! Thanks.