Jim wanted me to post a few photos of my 1903 Bisley .44-40 Revolver Mainspring. Jim had to work on the action as it the worst "train wreck" probably ever and it still worked. This Mainspring is original to the revolver and was used by my GG Uncle that went West in the late 1890s. He worked on ranches while there and this was his revolver....he wa a real Cowboy. He returned to South Carolina in the mid-1950s where he passed away a few years later.
Anyway, this is what an origina Colt Mainspring should look like with the top, botton, and side surfaced show NO marks whatever. From the photo of the revolver, you can see that it was used/carried a lot nd the mainspring is still working well. Yes, it is a heavy Spring, but that is the way Colt made them so it would fire any cartridge, old black powder or the new smokeless powder. I love the feel and cocking action of the original!