The nipple that goes on top the the clutch pressure plate. I've just lost another one. I forget that it's still on, flip the engine over and it magically bounces off somewhere to hide with all my left handed shop gloves. Just spent an hour searching for it with no luck.
Anyone make one successfully? A cable end nipple looks close if you cut the end off.
Might be of interest to Adam or Woody
Friend of mine owns a Yamaha shop. He just took on this race track and is always looking for racing organizations to get on the track.