List, With agraffes you want a hole that looks like )( instead of ><. What Brian is proposing will provide a conical hole when what is needed is a rounded hole shoulder like the inside of a doughnut or bagel. Pianotek provided a taper cut reamer a while ago which did not work well. Later the produced a reamer that cut the hole similar to a round over router bit. LOOK inside these holes and you will see what I mean. Newton
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