Hi, having removed both rockerbox covers to check tappets the right side tappet lock nuts are on the inside of the rocker arm, exhaust locknut thinner than inlet valve tappet locknut. On the left side the locknuts are on the outside of the rocker arms (at the extreme end of the threads). Looking at the manual I think the nuts should be on the inner side of the rocker arms but shouldn't all the nuts be thin to maximise tappet adjustment? Also, what is best for to seal the rockerbox centre screw, cork, fibre washer, o ring then fibre washer? Any help appreciated. Thanks, Paul J