i did everything in the how two but on the 1/4" male barbed hose adaptor when you screw it in the underneath part is it suppost to have so much mettal sticking out? cause now when i pust on the valve from underneath it does not move much cause it hits the mettal from the hose adptor. is it not suppo...

i have read a bunch on pistons and the help but could someone explain exactly how they work, how to build the piston and the chamber , and how much more they help. thx for any help i been doing alot of research and can find plenty of info on how to make a piston but not what it does, how it works , ...