For heavy use start softer. For light use you can start harder. In this case, I would go with Ronsen Wurzen. You need something firm enough for the Yamaha tonal model but not so firm that you are doing a lot of initial voicing to get the tone down to where you want it and even more to keep it there. David Love davidlovepianos at comcast.net www.davidlovepianos.com ...While we're on the subject I have some experience with Abel hammers and almost none with Renners, for longevity in a classroom situation and that will still retain some tonal qualities what hammers would you recommend? Mike
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