Could you please send me a link on how to make a pump, i had a bicycle pump but broke it at 200 psi. I want to know how to make one out of copper pipe and have it be capable of higher pressures.

for a barrel sealer should i have my barrel go into the tee or should i use a hose barb

If i am molding a piston out of the connector that the piston will slide in, i will need to make a slight equalization hole because the piston is the same exact size as the gun itself, correct? And how large should my equalization hole be if the piston is 3/4 in wide or about two CM. I am planning o...