Ron- Thank you for your speedy consideration. You get extra credit for your same-day response. Perhaps, for my own mind, I can try to be clear about one issue at a time. At 02:35 PM 05/12/2001 -0500, you wrote: > How do the 'Lines of Force' differ in an openface block; bushing-less covered > block; covered block with bushings? The force and leverage thing is mostly an issue of how much unsupported pin there is between the bottom of the coil and the highest point of support, be that pinblock top, bushing, or plate contact. This determines the tendency to flagpole, and the psi load on the block. DS comment: (Actually sneaking in 3 questions) Ron, the "Lines of Force" to which I was referring comes from one of Joe Garrett's posting to this thread ( Fri, 11 May 2001 20:56:40 -0700). The comparison between open face and covered (without bushings) asks to explain the active purpose of the webbing in the support scheme, if same result can be achieved without such. Is the open face block installed in a significantly different way than the covered block? The 'Lines of Force' issue with the tuning pin bushing vs. non-bushing is whether the pull of the strings on the block in the direction of the plate flange is reversed by the pivotal function of the bushings. Is there agreement on this question? David Skolnik
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