Try repositioning the jack under the knuckle, even if out of regulation. Make sure the rep height is right. Any chance of swapping out a new Renner S & F and and hanging the hammer on it? I think Tokiwa knuckles can be hard. Maybe just change one knuckle with a Renner knuckle David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "Gene Nelson" <nelsong at intune88.com> To: pianotech at ptg.org Received: 2/28/2010 8:26:16 PM Subject: Re: [pianotech] hammer return noise >Cloth is new and keys are level, dip set, action fine regulated. > ----- Original Message ----- > From: Cy Shuster > To: pianotech at ptg.org > Sent: Sunday, February 28, 2010 8:07 PM > Subject: Re: [pianotech] hammer return noise > I agree with Zeno. Backrail cloth in good condition is not only important for noise, >but for key leveling, and hence good regulation. Big win for small cost. > --Cy-- > Cy Shuster, RPT > Albuquerque, NM > www.shusterpiano.com > On Feb 28, 2010, at 8:27 PM, Gene Nelson wrote: > Having a difficult time reducing hammer return noise > on a piano with new Tokiwa whips & shanks, new hammers, key capstans, back >checks, key pins and bushings, front and balance rail punchings, key buttons, and >key end felt. > Key frame is properly bedded. > Action is regulated. > All action frame joints and screws are solid and tight. > All action parts screws are tight. > All centers are at optimal friction with no wobble. > All hammer glue joints are solid. > All whippen glue joints are solid. > Hammer rest rail has new felt, is adjusted at correct height and nuts are tight. > Key stop rail has new felt and is adjusted for minimal up key movement. > I have checked the knuckles - the core is firm dense felt and a needle easily goes >in from the side. Buckskin is not too tight over cores. > I have had minimal to zero results using my sugar coater on the knuckle buck skin. > I can depress the key about 2mm, release it and give a slightly woody clunk upon >return. > Noise is a bit louder when hammer falls after releasing from check. > Happens on the bench and when secured in the action cavity. > It is noticeable when playing especially in the upper treble section with lid closed >but the noise exists in the lower parts as well but not quite so noticeable when >playing. > Any ideas would be helpful. > At some point I should just give up and accept it as normal action noise? > Thanks for your thoughts. > Gene
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