> the picture is more complicated that just these measurements You are absolutely right. My point was, and is, that those numbers are where you _start_. There are many other factors to account for but without understand David's system you have almost no hope of coming to a "best" solution to an action problem. It was not obvious to me from the early posts that there was that understanding in place. Hence my soapbox. Have a lovely Sunday all. Me, I am off to fix a block/back separation on a cheap 1950s Jensen (groan). Newton
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