this is something I came up with yesterday. take the little plastic valve stem covers off, then get a .45 cal handgun shell, put some epoxy putty in the bottom, then push the tire cap in flush. use them on your car, or put them on the schrader valves on your pneumatic guns when your not using them.
I am about to go to church, so I cant go out and check, but I'm 99.99 percent positive that they are 45 cal, not 40 cal. I used some silver federal 45 auto shells my uncle gave me from his glock.
