Also, the o-rings were spliced by Parker Seal, they weren’t molded as a ring but as cord stock then cut to length and spliced after. The splice is usually done on a very acute angle to give a larger cross section for the adhesive or vulcanizing to bond securely. Properly bonded by either method will result in a bond at least as strong as the o-ring in its natural shape anywhere else.
That somewhat answers my question as to the assembly of the o- rings. From my grinding experience, the o-rings might’ve been fed in a centerless grinder, thru the front and out the back, not between centers. I know most people won’t know what I’m talking about, but it just makes sense to me. Thanks. It makes a lot of sense that the ends were cut at an acute angle and spliced.