I'm also on a mission to complete a Long E or Mark II, but I keep screwing up my hz 6460 movements. Decided to mock up the movement holder, clamp, and screw fitment with parts I already damaged.
-destroyed BiVintage insert
-scratched Raffles dial
-broken movement and scratched crystal
I'll switch out all the parts once I get the stem length right, but I just needed some motivation. After a few years of no issues, the keyless and date wheels on the HZ6460s have come back to haunt me with a vengeance