Hi Bob, I'll clarify the points as I see them. >> 3. Clean the ends of the springs with naptha. > >Naptha?? A clean cloth does the job Not always, go down south and see some vergris on the spring, I have seen some that have even required metal polish. This is not just peculiar to Yamaha. > . >> 7. Reburnish with the sharpened shank. > >Burnish... OK....Yamaha doesn't use dag. I know, but it seems to make a big difference in fine regulation > >> 8. Reassemble and budget for a major reg. > >Eliminating the the "friction" in the rep spring groove constitutes "major >regulation"???? You bet, uneven friction at this point, can effect hammer line, rep spring tension and checking height. Gina Carter and I have just completed an extensive series of articles for the journal to start in Feb/Mar? Titled inter active grand regulation, at that time we will reveal all. I also have had the benefit of some Yamaha training at their grand plant. But the approach that I take is just my own opinion. Uneven friction is probably one of the least understood problem with regards to touch AND voicing, in the field of piano service. Not just on rep springs. Hope this makes my position clearer. Roger Roger Jolly Saskatoon, Canada. 306-665-0213 Fax 652-0505
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