Can someone ID this type of J shell holder??????

[IllinoisCoyoteHunter]

This shell holder is marked #12. What the heck is the purpose of the extra spring-loaded thingamabobber? Thanks!

124993

124994

124995

[44Vaquero]

It was for the Lyman E-Z loader press it was placed in the right most position and the primer feed attachment was connected to it!124996

#12 is 9mm case head.

[waltherboy4040]

Primer slot feed.

[IllinoisCoyoteHunter]

Great! Thanks guys! I figured it had something to do with the primers being fed, but not sure how or what press. Thanks for the quick replies! If anyone needs it gimme a holler.