I have this M314A1 fitted with a M44A2 dummy fuze, won at auction,( needs repaint to grey). I have a few M565 MT fuzes laying around thinking one would fit the shell. It does not. The M44 dummy fuze is 1 5/8 dia, the M565 MT is 2". Why? An M314 crate I have is stenciled " M314A3 w/ fuze M565..." Specifics markings. TM id's - M44: fuze, MT, Dummy, M44 series. My fuze is marked " Fuze, Dummy, M44A2". My projectile is marked " TIN 10-6-105mm - M314 - A1- 54". Any thoughts as to why a standard Thread MT fuze is to big to fit?