>As for the tray pin location... When relocating the pivot in-line with the flange centers getting the new pivot hole located in the support block is not difficult. To maintain the forward location of the top flange there is a simple procedure. With the tray and support blocks on the bench, measure from the back of the support block to the old top flange center. (The tray should be parallel to the bench or perpendicular if you place the backs of the support blocks on the bench). Measure the distance between the new top flange and lever flange centers. Subtract this from the previous measurement and that is the distance from the back of the support block to drill your new hole. Ascertain first if the top flange is situated well and the forwards portion of the lever is free. To ascertain the height, it is equally as simple. This can be applied to original back action modification to improve motion. Many times the lever is at too great of a downwards angle to the key and scrubs a trough in the end felt; meaning that the pivot center is too high. There is the least sliding motion (friction) when the lever is parallel to the keybed. There is no reason to have the key elevate the lever beyond parallel because that introduces sliding friction and crushes the back edge of the felt, counter productive. Lifting to parallel is ideal. On a Steinway, the key end felt lifts to ~1 3/4". The distance from the bottom of the lever to the center is 3/8". So for the lever to be lifted to that height and remain parallel to the bed, the pivot height should be 2 1/8". An easy way to setup the whole system on the bench is to measure from the belly rail to the front of the keybed where the front of the keyframe ends. Place masking tape at that distance on the bench and locate the action and back action therein. You can worry about a Magic Line but I don't think that it matters as long as there is proper lift motion as mentioned above, especially way out at the end of the ke and beyond. I usually keep the same support blocks and screw hole alignment. The new pivot hole will be forwards of the old hole, if it is too close to the front edge, I'll shim the rear. If the new hole is too close to the old hole then I'll cut a 1/4" plug from the lower, rear corner of the support block and plug the old hole., can't get a better plug than that. -- Regards, Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20081230/b8edce37/attachment-0001.html>
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