Front. The piston wouldn’t come out at all—I almost cried—but I completely blocked the passage and opened the air regulator all the way!
It came off.
This is the cause of the poor operation. Scratches on the side of the cylinder…
The piston catches on this step with a “click!” and that’s what causes the poor return.
The dust seal and oil seal had hardened, so the piston wasn’t moving smoothly.
