If I could remember where I put my Pt Jude 15 brochure, I'd have a clue........ I'll keep checking.
I know that on my 1979 O'DAY Day Sailer the Mainsheet is attached to a becket on the top block, comes down and aft through the top sheave of the lower block, then back up and forward through the top block, then back down and aft through the bottom sheave of the lower block and into the camcleat. I don't remember if your PT. Jude is rigged same, but I'll look for that brochure.
I wouldn't mind seeing that one when you find it. I was wondering who first made the glass version.