Yup I did it. Got to looking at those hump thingies on my carcano trigger(it really is not bad after cleaning and light polishing) but I wondered how a ball bearing set into the hump would work. To the mill and some crazy glue and have a bearing set into middle hump making it look like it grey into the metal! Figured I would use the middle hump and keep it higher so the rear hump isn't needed. It works real good. Has a first stage that comes back a little(real easy like and then it hits a wall and you apply your finger to fire) and it has about a 5 pound pull but it breaks like glass, so the heavier pull than desired is quickly forgotten. Now I got the idea to find a thin piece of stainless steel and fit and glue a thin piece into reciever for ball to slide on. Should be better yet I believe. Any body else ever try this? The sear and cocking piece were nasty looking so I filled them with diamond files to a nice clean surface. The sear sets about as high unto cocking piece as the original piece. I included that info for the naysayers who might think I got the sear too shallow on cocking piece.