Free: Contests & Raffles.
Can you remove one of the other adjacent screws? If so, I have a gunsmith I've dealt with for years that would be able to either match it or fabricate a new one. Do you know if it's a wood screw or a machine screw?
Mike Nelson he’s on N 15th just west of N Proctor. Best shotgun smith in the area and only a few miles from you in UP. pM me if you want his number