I just got a 1982 R65 that has not been ridden since 98 and has been just sitting around rusting but appears to be salvageable. I have a manual on order, but until it gets here, does anyone know how to remove the seat without breaking something. The key turns (barely) but it won't unlatch. I suspect the mechanism is rusted but I can't see it. I've put the penetrating oil to it the best I could, but no luck yet. Any suggestions would be appreciated.