Thanks for the Speedy Responses. Both of your conclusions i feel are very reasonable and i had some anticipation that those might have been the problem. I will Try the Felt First as a quick fix. However in the long run. i am fortunate enough to have 3D printer at School that i can use to print out a ...

After the Completion of my first piston valve launcher i seemed to have hit a snag. everything seals and air is held correctly with no leaks. However when i release the air from the pilot valve the piston does not move. All air just gets let out through my sprinkler valve. I have attached pictures ...