Jeff,
"Off the shelf" I guess. We use CNC brake parts slave cylinders.
http://www.cncbrakes.com/sc.asp?grp=...305&subseries=
We could make them ourselves, but they gave us a good deal and so I don't have to worry about making them ourselves. If they price gets too high, then we will make them ourselves and I think people know that. They work really well. The pedal effort is 1/2 the McLeod hydraulic throw out bearing and probably 1/10th of a Tilton...ok, I am exaggerating, but we did use one to catch a grizzly once...
David
