This video from P Hoffman is invaluable.
Not sure I'd know how to make one to be honest?I’ll try and cut a long story short....
Gearbox went belly up on my K1200 Sport, went and bought an 11000 mile K1300 engine for the gearbox.
I have two mates who run a small motorcycle repair business and they stripped the bike and engine, the 1300 clutch doesn’t fit their to many teeth on the sprocket/wheel at the back so the chain will not go on,they fitted the OE clutch and it works fine.
Just phoned them up(I see them every day) asking if they had to buy a pin and they said no made one up.