Hi folks. Just ran into a Yamaha C108 yesterday with several jumpy hamers. All were typical bobblers off a jack top at light play. Most of them were solved by simply taking a screw driver and inserting it into the upper winds of the jack spring, compressing it fully for a few seconds. Two whippens were pulled after I found jacks too slowly returning after the "treatment". Centers were a bit tight so I changed them, and all is well. Got to thinking a bit about this tho, and wondered about shimming the bottom of the whippen flange as an alternative approach. That would lessen the angle of the jack to hammer butt and I would think make it easier for the butt to push the jack top away. Shouldnt be a problem as long as there is still enough of an angle for the jack to push the butt forward with enough strength. Would like to hear anyones thoughts on the matter. Cheers RicB
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