All, There is always some scrap left over after cutting the block to dimension. Use that to drill various holes with various drill bits. Be sure to be VERY exact in your procedure, ie drill each different bit hole the same. Same amount of cooling, same amount of plunge speed, etc. That's a must. If you are using pin driving fluid, then use it on each sample. Then drive the pins, (making sure they are all the EXACT same size), and get out your trusty torque wrench, calibrated in INCH POUNDS. Consult the chart for proper torque required and go with the best one. Not really rocket science, but it works for me. I should say that I have found each block to be just slightly different, hence a different bit for each one. Also, make darned sure the bit is sharp! Best Regards, Joe Garrett, RPT, (Oregon)
This PTG archive page provided courtesy of Moy Piano Service, LLC