I'd like to briefly look again at where keyframe meets keybed. It's the foundation of our regulating, but because not much of what's at play can actually be seen or directly accessed, we are challenged to apply what we think and see what happens. And thinking evolves. I am familiar with at least four categories of keyframe bedding: the shimmed and securely fastened upright, the full-fitting/no-glidebolt grand, the stiff Steinway/Mason style grand, and the more flexible Yamaha/Kawai style grand. The upright keyframe has...
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