[Tommy]

Regarding the worn master cylinder: I bought my Cobra used and soon discovered that misalignment of the clutch rod had applied side forces to the aluminum master cylinder and caused it to wear into a leaky oblong shape. When I tried to change the geometry of the clutch rod I discovered that the original builder had boxed himself into a corner and it could not be aligned completely. So, I replaced the leaky aluminum master cylinder with a similar one made of steel. I figured it would take a bit longer for it to wear out. More than ten years later it's still dry.