Long shot here, but worth a try...
My internet research indicated an 8.5mm seal would suit my Synchronika, seems it's too large. Anyone have a spare 8mm and want to play Cinderella before I suck it up and pay $10 postage on a $12 part?
Condition is as new - fitted but no shots run as it was obvious the pf lugs wouldn't engage properly.
Original part: https://www.coffeeparts.com.au/80002-s