Hi Jon I suspected the hammer rail as well. Have this same kind of problem on a couple Yamaha C7's tho... completely different rail tho I know there are claims of hammer rail flex there as well. Thing is an artificial stiffening of the rail does not change anything... i.e. using some tools in different ways to stiffen the thing as a check. Nor does applying pressure to the rail show any tendency for hammers to move. So I have to wonder if the hammer rail is involved... and if so, why does the bass only get affected ? Seems like at least the low tenor hammers are heavy enough if it had to do with hammer weight as well. Got any good tests to confirm its the hammer rail for me ? Cheers RicB >...the neighboring hammers started to bounce... Sounds like Tubular Action Rail flex. Short of replacing the rails with study engineered material coupling the rails will reduce this interaction. -- Regards, Jon Page
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