My new to me, Super Blackhawks cylinder pin was backing out under recoil so I replaced it with a Wolff extra power spring. All is good with my cowboy loads but it still backs out with full power stuff. I've got another Wolff spring I could throw in but I'm wondering if there's another issue? Base pin under size? The gun was polished by a previous owner, could it have been polished enough to make it under sized? Base pins with a set screw are a lot of money so I'd like to avoid that if possible. Thanks.