could you tell me exactly what size o-rings you used on the plunger? on the diagrams you said 1 and 1/8 by 1/8, however i am confused because they go around 1/2 inch pvc so how would this work if the o-ring is almost twice the diameter of the piece it is going on?
jdp204 (or anybody else who has one) could you test the strengh of the spring for me. about how many pounds does it take to push it down an inch (or any other given length)