Gregor, you have had a lot of good advice and things to look for. I would like to add two more things, although I do not think they are humidity related: You say the player senses increased resistance deep near the bottom of the key dip. 1) Front rail punchings: One thing could be that the front rail punchings are thing and spongy. When testing for after touch, a technician will often press the key right down to the bottom so it is resting solidly on the front rail punching. When player is playing moderately, a front rail punching which is not firm enough will give the player resistance up to and over 1 mm before the key is really bottomed out. Result: the hammer bobbles. As a test for this you can remove one front rail punching and set key using only cardboard punchings. Set dip to the specs and see if the hammer still bobbles. If it does, the front rail punchings are not firm enough. 2) Balance pin holes in the bottom of the key: if the thickness of the wood at the bottom of the key at eh balance pin hole exceeds 3 or 4 mm, the player will encounter resistance near the bottom of the keystroke. Test for this by removing the action and the FR punching on one key and slowly depress the key to feel for resistance at 10 mm dip - there should be none. If there is, use a balance hole reamer (JD would correctly say counter-bore) and remove material from the inside of the balance pin hole from the top Jurgen Goering Piano Forte Supply (250) 754-2440 info at pianofortesupply.com http://www.pianofortesupply.com -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 1582 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090122/a299c28f/attachment.bin> -------------- next part -------------- A non-text attachment was scrubbed... Name: bal.ream._macro.a.a.jpg Type: image/jpeg Size: 2996 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090122/a299c28f/attachment.jpg>
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