Dan gave me a copy of those drawings and I noticed the pivots. Unfortunately I couldn’t get past the fact that I had NOS pins a felt obligated to use them. They were in some stuff my brother gave me. I finally decided to try and figure out what they were for because they were in with some interesting bits. Took a while, but finally stumbled across drawing MO46. I think that’s how I ended up spiralling down this rabbit hole in the first place.