Mine was used (almost free) when I bought my 5# CO2 tank off Craigslist.
It has worked fine for a couple of months but now shows signs of sticking a little. I might set the pressure at 8 and come home to find it at 12. When I dial it up, nothing happens and then it jumps a couple lbs at once.
Can I clean it or rebuild it?
On Tap - Pale Ale, Centiennal Blonde
Primary - Dry Irish Stout, Dead Guy Ale, Mild Mannered Ale
Crash Chilling -