That does clarify a lot of what you were describing. Three questions:
1. why a hole in each corner of the "tombstone"? just options? I'm thinking i only need one stop pin.
2. does it really need a set screw? My thinking is if it freely rotates, who cares? Since one it is at the bottom of the cam stroke, it's not going anywhere.
3. can the hole for that you show tapped 5/16"-18 be 1/4"-20? I have taps, but I'm trying to keep it simple for others. I already require 3 tap sizes for the current build. Just a thought.
Thanks for all the input. It's a pretty slick set-up. I think others will get a kick out of it, if I can post a good video showing how it works and the exploded views to see how simple it is. I am kind of disapointed that the other idea is not likely to work, since i had it layed out that you wouldn't see the cam slot, at all and the only thing on the left you'd see is the arm to actuate the cam stroke.