"at the same time the pin is tapered and a thicker portion of the pin has moved into a different part of the hole along it's entire length". I wasn't aware of tuning pins as being tapered. Of course the *square* is tapered, but surely the threaded part which goes into the pinblock, is parallel? I just measured on and it's parallel along its length. If it was tapered, how would you know where to measure, to get the correct thickness measurement for ordering new ones? I understood the principal active effect of driving the pin further into the block to be that the end of the pin would now be gripped by a "fresh" portion of the pinblock hole which had not hitherto had any pin in it and therefore stood a better chance of gripping. I can see that the disturbance of driving the threaded pin along the hole might also disturb pinblock fibres in a way that cold cause them to grip better. Best, David.
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