Gaugedrifles;
One further question on these bbls, the Scott patent Pete mentioned would seem to be the most likely one referred to. Is the portion of the front lump which contains the hook for the hinge made seperate to the rest of the lump. If so it should then be adjustable for taking out play by turning in the screw in bottom of lump. If this be the case would be nice if you could post a close-up of this feature, have never seen on of them.
Miller

Miller/TN
I Didn't Say Everything I Said, Yogi Berra