Some detective work for this Saturday morning: Piano - Kawai NS-20 - tall upright with one of those split lid fold back tops. Complaint - some damper ringing randomly.... Owner couldn't replicate the problem earlier this month during the regular tuning visit, so I asked if theycould find out what note(s), during what pieces. Went back today after I was notified only C4 happened sometimes... So - noticed an old coffee spill leaked between the split top down onto the muffler rail and then farther down... right at C4. Piano w/plenty of plastic parts. Took out the action, still couldn't make the damper hang... Reversed it, gently pressing on dampers - C4 felt "different" - harder to push. Turns out the spring was glued to the damper lever by the spill. Along with a mess on the spoon. Cleaned, lubed - everything seems fine, but for the life of me, I can't come up with a reason why a constrained spring would make the damper hang up and ring??? Hmmm.. Ron Kovalchicagoland www.ronkoval.com
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