Patrick
I snapped the head off my first clutch master cylinder input shaft (genuine donor BMW) before I ever got my car on the road, due to poor alignment with the clutch pedal.
What I eventually found was that master cylinder input shaft has a limited ability to accept the change in angle created by the clutch pedal passing through an arc. After 3/4 pedal travel the m/c input shaft began to bind on its own casing and further pedal movement generated a lateral force on the shaft which very quickly failed.
By trial and error I eventually found a new location where the master cylinder input shaft always remained within its own arc limits as the clutch pedal went through its full movement.
Since changing the alignment (touch wood!) it seems to operate really well, and I've had no more problems.
Mike
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