Originally Posted by
Bill in VA
With the old plastic body frame pump it is similar. Valve stem at the top, push the chuck all the way on. When done, hold the metal grip area with your hand as close to the chuck as possible, and strike you hand STRAIGHT down.
Occasionally, back pressure would develop on these while pumping and the handle/piston would come out. Back in the 80s, a lady friend of mine was using one one time when it "backfired" and rocketed into the side of an old Toyota and dented it.
