You need to hold the base of the bezel firmly so that you can the push the top over. You've attempted to do this by holding in a vice but this will not be good enough.

Use some polymorph, coolmorph etc and pack this around the shank and base of the bezel. While it is still soft squeeze the polymorph around the shank in the vice, not too tight. When the polymorph is set firmly, tighten the vice and then you can push the bezel over.

When firmly set remove the polymorph.