The wonderful thing about working in a university situation is that you can experiment and learn. I have used pliers and have not been happy with the results. Not enough for too much work and blisters. I have dipped hammers in a solution of near boiling water and Woolite for good results but the strike point becomes quite narrow requiring extra spacing time. No real problem and they did come down mostly. A little needling finished the job after a _lot_ of filing. I have tried needles. After three days I said enough already. I did not get the sound I wanted but it was not as bright. I used steam on a Kawai and the results were rather nice with next to no effort. I used a portable clothes steamer about the size of a pint bottle of Scotch. Steamer lower over hammers standing up so it took maybe ten seconds to cover the whole line left to right. Go a little slower in the bass and maybe go over them a little, very little, on the shoulders. I have not used the wet cloth method but I do like it. Control don't you know. Some technicians have said that steaming will ruin a set of Yamaha hammers. Ruin is a relative term but based upon whose standards? I am sure Yamaha feels it ruins their hammers but if it does what you want to get then you are meeting your objectives. We Americans prefer to hear a different sound than the Asians do, just my observation. Out of pure self defense I was putting Ronson hammers on Kawais to help prevent broken treble strings. I was absolutely stunned at how open and round the tone became. BIG bass, nicely balanced middle and not so shrill a treble but still a nice round tone. So what if you "ruin" a set of hammers. Change them, I would like a set of Abels myself. Get radical. Newton
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