I installed new piston ect and put gun back together. Now my power regulator wont work. I never removed handle or any of that stuff. Before when it was on max and unloaded i would switch to low and run shaft down a few runs and it would get easier. Now its stuck on high power. Not that i really use low. But its just bothering me that it isnt working. I assume i must take barrel off at handle? Any tips. Thank you.