ejector spring

I have a 1939 shooter, all matching parts that my dad got in the war. The ejector spring broke after a thousand rounds that I know about. I purchased 4 reproduction ejector springs and all have broken after 2 hundred rounds or less ... I have just purchased an other reproduction spring and I have found an origional.


They all break at the chamber end (front) I have installed all the replacement springs my self, with great difficulty, but once installed they seam fine. Is there some trick to the instalation ..like heating the spring ?? I simply hold the weapon in a vise and push from the rear with a blunt flat tip.


Does anyone know why I am having this problem. Your thoughts please. Thanks Dan