1978 R100S, MOTUS (delayed my retirement), 2014 F800 GSA, 2010 R1200 GSA, 2013 Triumph Thuxton, from my friend, Randy Lusk. USMC, Motor Officer, SF... Been there, done that, got the t-shirt, then got too fat to wear it. Rode Prudhoe Bay to Key West, no room for a t-shirt on that 30 day, 13,500 mile odyssey.
My 92 seat maybe, most likely different. But I can look if it will help.
92 R100RT/69 R69S
2004 Aprilia Atlantic 500cc single cylinder Scooter
83 Honda V65 Magna, fastest production bike in1983
https://brook.reams.me/bmw-motorcycle-r ... eat-latch/
Another bike on this page:
https://brook.reams.me/bmw-motorcycle-r ... eat-locks/
'78 R100/7 '69 R69S '52 R25/2
Perhaps it is the fiberglass base causing the problem. Anyway, it does take a bit of fiddling around to get them adjusted properly so they latch properly.
In my worst case episode, due to the pin not latching, I had one of the seat hinges tear out requiring the seat to be sent back to Corbin. They were nice enough to repair it.
I can imagine the stock metal seats are far better for the pin staying adjusted. St.