Our latest version of our clutch stop (aka The Big Boy), is now a stout 61mm in diameter (versus the original 32mm). Since the clutch arm on most late model BMWs are made from plastic (and have very poor fitting clutch arm bushings), the clutch arm tends to move laterally a bit, allowing the clutch arm to slip a smaller diameter stop. With the enlarged surface area of the The Big Boy, this is no longer an issue! Even with the sloppiest of clutch arms, the larger diameter will not let the clutch arm past.
The Big Boy uses an M10 threaded post which is permanently attached to the metallic base. A black urethane surface is then bonded to the metallic base.
The assembly is completed with a stainless steel washer and jam nut, which are used to allow for setting the appropriate setting of the clutch stop.