1) Is the piston or gasket (part 1A & 1B) removable for cleaning? If not, how do you clean them?
2) The air release valve (part 9A) is making it nearly impossible to remove the cylinder (part 2). Do I need to tighten the acorn nut (part 9B) to lift up the release valve? If so, how much gap should I leave between the piston and the valve?