Hi ROn What's the decimal equivalent of 6.8mm. I find that a letter f .257 is a bit too tight for the block you are describing. .261 seems better in CA climate. I hate tight tuning blocks. A tight block in a piano makes for it to be more likely to be more out of tune more of it's life. JMHO You Know? Dale: > All the 1/4" holes first, then all the 6.8mm. Just one bit change between > passes. It has always been my impression that it would be difficult not to > center the second pass. I drill in the piano, with my hovercraft drill > press setup, and the second pass seems to center pretty much automatically > with a regular jobber bit. Maybe there's a potential problem I'm not aware > of here. What sort of drilling rig and procedure do you use? > Ron N > ************************************** See what's free at http://www.aol.com. -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070526/79b29f9e/attachment.html
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