How about the rest of the regulation, like letoff, blow distance, etc? I assume that the piano was in playable condition before, and now has a new problem. If they are going under the butts but there's too much lost motion, the hammers won't check properly and they'll feel loose at the key. If the jacks aren't going under the butts for repetition, you need more lost motion.
I'm having trouble understanding exactly what the problem is. Getting the hammers to rebound onto the rail swiftly is not a characteristic of these pianos, even when new. These pianos have the spring/loop return springs that aren't easily strengthened. They are supposed to go under the butts, no? If they don't, then it's a problem.
You state that "but the jacks are getting under the butts while the action is in the piano". The bridle straps do help somewhat with repetition, but it's not their main function. Are you sure that the flanges are free? Sounds like they might be too tight. The corrosion is probably going to weaken them and break eventually. The bridle straps are kind of long, but I bent a few wires back to adjust this and it didn't solve the problem.Īny suggestions of what to try before replacing all the hammer springs would be greatly appreciated.Īfter all the work that you put into it, I'd replace those springs. The hammer springs are fairly corroded from mousy activity, and probably need replacing - but I'm fairly new to this, and I don't want to overlook a simpler and less expensive alternative for my client. It feels like the hammers have very little momentum backwards - they don't block on a medium-hard blow where the hammer rebounds off the strings, but a soft blow makes this happen fairly consistently. I can manually reset them but it happens again almost right away. Upon returning the action to it's owner, about 2 dozen of the keys are blocked - not against the strings, but the jacks are getting under the butts while the action is in the piano. New hammers, dampers, bridle straps - essentially replaced all the felt.
I recently did a bunch of work on a U-107 action that had been feasted upon by mice.
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