There are a few Butler users here on this forum, perhaps they might be able to help you. What do you mean by stuck? How old is the unit?
this happen with our unit when not engage for over a week or two. we simply spray tons of w40 and use a large pipe wrench directly on the shaft behind the braket. start by tap back and forth before you apply your full strength. taping helps the shaft to vibrate specially when you get it to ring. Butler uses top component and been a great unit for us http://raleigh.sanosteam.com/