O ring 12x2.75mm, Lambretta gear selector arms, 1st oversized, MB

Standard 12 x 2.5mm O rings for the gear selector arm shaft and the clutch arm are sometimes a little too small and can leak.

Try an oversized 3mm version and they can be too tight.

This MB 12 x 2.75mm inbetween version usually works perfect and stops leaks.