you will have to further define "wiggle", are you pushing it fully or just "wiggling" it, I would assume it will have a bit of wiggle/slop, its not really that precision of a piece. There is a spring you are working against, it isn't really stiff, but you definitely know if you are compressing it or not. you should get suction and pressure if you are operating it by hand. but I am not so sure you are running it through its paces completely. The word "wiggle: is the one that gets me, there should be no action that resembles wiggling that would make the pump work or not work
