I would not drill the bolt holes untill I had pulled the pin block back with pipe clamps (lots of pipe clamps) as far as possible or as far as I intend it to go. This will prevent the wood chips made while drilling the bolt holes from falling down in the gap and causing more problems. Once I have the pin block back in place I have always been able to take off 1 or 2 of the pipe clamps if they are in the way for drilling without the pin block moving. I am not sure, if once you let the tension down some, if letting it down more wil make tunning any harder so I let it down a lot (half to three quarter turn) so I know I am not fighting it. John Dewey
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