Nice write up. I did this to my Gran Torino way back, used a clock from a new {then} 81 cougar. I think I must have taken it apart a little more as I didn't cut anything. IIRC it was kind of a R&R deal and my adjuster still worked. Might be the difference with the 65 clock. You should be able to do this to all the clocks with a B {Borg?} stamped on the case. Vendors also sell just the quartz works in Hemmings. But if your like most of us more time than money, junk yard is the way to go.