Originally Posted by Sailor Steve

It's too bad the real kaleuns didn't have that option. There was no switch that let you select one or the other, or at least not until 1944. Disabling the magnetic pistol required removing it from the torpedo, a process that took at least an hour. Once the order was given in 1940 to remove them they were all removed, and not replaced until the new version came out late in 1943.