eightbore,

According to Price and Pjestad dimensions of 1/2 frame and 1 frame are ALL different, but one: distance between strikers. On the other hand, distance across hinge is the same (1,5 in.) for 1/2, 0, 00 and 000 frames. This explains why a 0 frame forend will click in a 1/2 frame. I have the impression that yours is good but circumstantial evidence. I don´t see how was economically possible to make 1/2 frames out of 1 frames.

Regards