Anyone ever install one of the Cylinder and Slide safeties in a Mustang(https://cylinder-slide.com/Item/CS0079S )?  How much fitting was required?  I've messed around with 1911s under the watchful eye of an actual gunsmith a long time ago when I worked in a gun store for a bit but I've never pulled the little Mustang down past a field strip; unfortunately the gunsmith I used to know moved a long time ago.