This MB Scooters re-made Gear Selector Arm is modified not to use the circlip, but rather it comes with a stud, washer and nyloc nut.
HANDY HINT - When fitting this item set the selector to 2nd gear then fit the arm so that the external arm is around 90 degrees to the crankcase side gasket face. This will ensure that the gears will be in the correct position when all the cables are connected properly. TIP grease the stud before fitting the tie bar, fit the plain washer then the nyloc nut, tighten the nut tight then undo 1/8 of the turn so the tie bar can move.
MRB0406K