Q: Ruger MkII ball bearing size ???

[OneBarfly]

OK - After three tries installing (launching) that little ball bearing - the one you put at the bottom of the mainspring, I finally lost it for good. I must of sent it into space, because I never heard it land. I fiqure that I was lucky to have found it three times!

Does anybody know the size of the ball bearing???? I might as well buy a gross of these!

Also, Any tricks to stop losing these? Installation tips?

Cheers,

Rich