Hello All; I may have made an expensive mistake 😒 For quite some time I've been working on a 1975 Speedmaster Mark II with an Omega 861 movement. One of the problems was radial and axial play in & around the main-spring barrel. The 861 movement is known for its wear of the arbor hole in the barrel-bridge. To correct that, a bushing needs to be installed, for which I don't have the equipment. From pictures, according to our member @nickelsilver, the wear of the arbor-hole in the bar