I've been reading all of the interesting tips and tricks people have for regluing hammers. I've tried several of those approaches, with varying degrees of success.
I will say that the very first thing I do is get some CA glue soaked into the end of the felt tail whether on top or bottom where they are still attached. As I'm sure you know, once the felt pops off one side, the pressure is relieved and they usually stay attached on the other side. If you try to close them up without preemptively gluing the other side, there's a good chance the other side will pop off. So far my preferred method is to first spray CA glue kicker on the hammer felt (I hold a piece of thin cardboard over the wood so none of the accelerator gets to the wood), then I spread Zap-a-Gap CA glue on the wood. Then I press them together, either by hand or with pliers or vise grips. The real difficulty comes with the bigger bass hammers. Getting those to close up well by hand is not really doable on those large hammers. So then I have to use vise grips or pliers, which can be ok depending on the hammer shoulder width vs the size of pliers or vise grips.
I have not had good success with zip ties on the bass hammers. The zip ties seem to slip down the hammer curve too easily.
Again, a big part of why I wanted to bring this question to the group was to find a way to do this job QUICKLY and efficiently. Otherwise it's not worth taking on the job. I have an action in my shop right now on which EVERY hammer felt needs to be glued down (except for maybe an octave and a half in the high treble).
I like a lot of the ideas all of you have brought up. But what about those big bass hammers. They can put up quite a fight. Anybody else have trouble with them?
Thanks again for your input.
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Tim Jasnau
Makawao HI
808-633-6655
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Original Message:
Sent: 08-22-2021 15:37
From: Tim Jasnau
Subject: Regluing separated hammer felt
I live in Hawaii where the hammer felt on some pianos lifts of the wood core. This happens primarily on Baldwin pianos. I've also seen it happen on several sets of Renner Blue hammers. Some of these pianos have 40-60 hammers that need to be reglued. The high treble is least likely to separate. The bass hammers are most likely and can be very difficult to reglue.
I've tried different methods of gluing and clamping to fix the problem. I've yet to find a method that works very well without being overly labor intensive. I wonder what has worked best for some of you who have dealt with this.
I get good results with superglue, The challenge is to get the felt clamped down evenly and fully with no gaps. I saw a Journal article years ago on this topic that showed a particular clamp that was able to conform well to the shoulders to get a good tight glue joint, but I haven't been able to find that article again. Can anyone recommend the best type of clamp (and where to buy) and the most efficient method for doing the job?
Please don't bother to suggest putting on a new set of hammers. I'm talking mainly about Baldwin console pianos worth around $500 where the clients (and I) just want to save the piano from the dump.
Looking forward to hearing from techs who have experience with this problem.
Thanks,
Tim Jasnau
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