Make a tool to use on the bezel.
Start with a small thin-wall metal tube that has an ID slightly larger than the diameter of the shaft, and longer of course.
Use a grinder/Dremel to remove metal so that two prongs the size of the slots in the bezel remain (180 deg. apart).
Use pliers to turn the tool or fashion a handle with a small rod inserted crossways thru the tube.
Got it??