Dennis,
It can be on both depending on the Mfg. On some boosters the rod on the MC end has an adjustment, if not it can be replaced with a shorter rod. If the rod is too long it will certainly cause problems. I think you should contact the supplier before you go much further and make sure they are aware of the problem. Most have a tech support person. You also don't want to void the warranty by modifing something.
wags, your problem may be a result of having a residual built into the master and installing additional residual valves, you should check with your supplier to find out what they set it up for.
Fred
Last edited by rfs56trk; 12/08/2007 6:08 PM.