[Charlie]

I recommend the Tilton unit. It is more expensive, but in my opinion, the design is better. It uses a single flanged seal which slides and pushes against the piston, while the McLeod uses several stationary o-rings and a screwed-on back shell. I apparently overextended my McLeod unit and tension-failed several screws on the shell and extruded the o-rings. The McLeod design has an internally flanged piston which establishes a definite limit to its travel. I'm not sure what damage would have occured if I had overextended a Tilton instead. Possibly, the piston would just pop out (it is not flanged) and require reassembly with a new seal. But more likely, the piston would get cocked in the bore of the bearing and damage the housing. Hopefully, I will never find out. I don't blame McLeod for my stupidity, but I still believe the sliding seal arrangement of the Tilton is more reliable than the stationary o-rings on the McLeod. The sliding seal will expand (from hydraulic pressure) as it wears while the o-ring can't expand as it wears. The McLeod recommended a 3/4" master cylinder and the Tilton recommends a 7/8" master cylinder (at least for my application).
Beautifully smooth clutch action with this hydraulic unit. Best feeling clutch I ever had!