by Back2-2 » Sat Apr 04, 2020 3:58 pm
That actually looks like the seal failed sealing on the perimeter of the seal - not the what is called the "Lip" of the seal.
As for the pin. Best guess is that is was an alignment pin as you described.
Sounds like you are competent with mechanical skills and you are getting it sorted out.

Neil
Black Hills of SD
Life without Motorcycles would just be boring, really boring
Honda 450X. Yamaha Tracer GT900. HD Fat Boy. Triumph Bonneville. Yamaha Majesty 400. Yamaha Grizzly. Yamaha Wolverine. Yamaha TW200