Joe Wood has hit the nail on the head. I think the reason so many claim they do "Nothing" is that they in fact do absolutely "Nothing" to prevent the bbls from opening. That of course is not what they were designed or intended for. The Lefever uses a Doll's head with square front shoulders, which I feel is good as they have no tendency to wedge open their seat. On one parts Lefever I have which is in quite rough overall condition & on which the adjustable ball joint has been loosened I can back it up so it clears the hinge socket, close the gun & bolt it & it is tight on face from the Doll's Head alone. If fired a lot with only this support I don't know how well it would hold up, but working in conjunction with the hinge then it gives support on both sides of the chamber, IE both top & bottom, it will take an awful lot of proof to convince me that is not a good thing, even if the frame is strong enough to hold the forces in & of itself.
