Well, since i'm the only one replying to this thread... Gene Berg makes one that fits in a Mill, or drill press, and has good instructions too. I got one... wait for it... about eighteen years ago
. I think it was about $60 US back then.
Did you get your PM?
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG