[etphonehome]

you just custom order the piston as however long you want it to be

if you're trying to use an old piston that isn't quite the right lenth, but a little too long, put a mechanical stop in front of the piston so the piston stops
make sure you dial the flow controls way down so you don't wreck the stop or your piston when it hits

if the piston is too short just screw something onto the end to make it longer