I hope there is room on the list for beginners. I have rebuilt two uprights and am now doing my first grand. Of course, I have many questions. The one I wrestling with now is key dip and key leveling. The information I have says to decrease key dip by removing center shims. If I do that, then they won't be level. To level them would mean putting the shims back in. Is is right to add shims to the front to decrease key dip? On a related note (?) what is aftertouch? It sounds like an adjustment of something after the key has travelled the required 3/8". Hopefully, my naive questions are easy to answer. Gerald
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