Thanks really to Chris Evans for explaining what it was (!) and to David
Littlewood for prompting me to use excel calculated co-ordinates, which
worked well for a once off. It also prompted me to think about getting a
digital scale installed for the saddle traverse...
There's a program on Marv Klotz's site called 'ballcut' which performs
these calculations. If you're not familiar with Marv's stuff it's well
worth a look at <http://www.myvirtualnetwork.com/mklotz/ .
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