In my opinion the single most important change
was locating the cam follower. On the bolts I tapped
a 8-32 then machined a 45 deg. chamfer to .192 dia.
Same for the pins .192 / 8-32 with a 45 deg. transition.
A small slot on the pins, to seat them down. This
crated a solid and positive location. I had left the
bolts about .010 long. Locating from the cam pins I finished
the front and back of bolts to length. Bolt caps are per
Print. I also developed a very simple flat spring extractor.
Trying all 12 bolts in every bore, that’s 112 smooth extractions.
( Works great on the bench )
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