I received this gun in the form of a bag of parts - there is a spring broken inside one of the locks and I want to make sure I use the right terminology when I order a new one. So the gun is apparently a 1901 model - the serial number is in the 5000's, and has the designation '00 E', with the dates shown in the attached link.. Would I refer to it as an old-style hammerless ejector? And as far as the spring itself, is that a topspring / hammerspring / mainspring, or something else?