On my S&W 500, I used a swivel stud from a S/S double shotgun.
It has help up so far!
It gets two holes tapped and goes on the underlug, and the Hogue grip screw was replaced with a stud screw. I post the pics a while ago. Do a seach for 'My Babies'
and the pics will come up. You may be able to do the same with a SBH.
Gerry.