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I have a Skilsaw model 534. I can't get the new blade to tighten?

How do I get the new blade to tighten on my Skilsaw 534? The shaft turns as you tighten the nut that holds the blade in place. I can not find a button or anything that would lock the shaft while you tighten the fitting. Help? It 's old but so am I.
Joan T, April 2012