Don't confuse the guy with apples and oranges. He is talking about a servo for the air retract valve, not a retract servo for mechanical retracts. Big difference. Most servos used to operate the air valve can have their travel reduced via endpoint adjustments - no problem. Mechanical retract servos are a different animal. These are not normally proportional servos (JR makes both a proportional and a non-proportional retract servo) and travel 180 degrees and back to 0 degrees without stopping anywhere in between, regardless of what you do with the endpoint settings in the transmitter. Kurt