>If they bobble, try weakening the hammer butt springs by releasing the >spring from the cord, squeezing the two ends of the spring toward each >other slightly. You may also try your spring regulating tool. Once you >reengage the cord with the spring, it should flex the cord to its entire >length, if not you've gone too far. Remember- they only need a minimum of >spring tension- too much keeps the butt in contact with the jack for the >full cycle and causes the bobble. Eric, I'm confused. Seems to me that weakening the springs would increase the chances of bobbling rather than decrease. An old Mason & Risch vertical player (referred to in my other post) has these small butt mounted springs which hook onto a cord that attaches to the brass rail through a hole just below the butt plate. A few of these springs were broken, and not having wire of a small enough diameter to match what was there, I had to replace them with the smallest diameter rail mounted type springs cut and bent to shape. The result was that the only notes that could be regulated with a reasonably close let-off (1/8") were those with the heavier springs. (These were repairs carried out in the customer's home. If I had the action in the shop, I'd want to replace all the springs.) It appeared that, on this piano at least, the lighter the springs, the more likely they'd bobble. Pinning was free but not sloppy. Regards, Aaron Bousel Ormstown, QC Canada abousel@rocler.qc.ca
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