how to mount sprong

[makana59]

Hey guys,
I was just wondering how do you mount the sprong with the ofna gear? I tried to mount it as tight as possible but when I go in reverse the piece that holds the sprong on loosens and unscrews. I even tried putting the plate that screws the sprong on then putting a bolt after to hold the plate and still loosens. How do you guys mouint it? Thanks guys for the help. Grant