That is funny. I still use a can opener just like that and I still have my mom's flour sifter just like that. She taught me how to bake a cake by sifting the flour first. I did not know what that second thing was, though, and still don't....lol
you place the valve keepers in it...then just push against the stem and it installs them and holds in place while you release the spring compressor mine are nice and clean...those ones are just an internet picture from someone who doesnt take care of their tools
