hillbill- I take it this was not the military front sight assembly. The military front sight assemblies or mostly pinned in place and would not rotate if the pin were still in place. If this is an aftermarket piece, called a barrel band front sight, one may well find a set screw in the dovetail under the front sight. The ramp MUST be supported while pushing of tapping on the front sight. Permanent locktite combined with a set screw would probably hold although the proffessional fix would be to solder the band in place and apply the set screw. For this 'sweating' operation soft solder would be quite strong enough.. To get it lined up I would lock the barreled action in a vise(lightly) and using a spirit level, level the action horizontally(taking measurements on the bottom of the action, on the mauser). Then using a level one can use any horizontal or vertical surface of the front sight to get the sight vertical. A note is in order here. I have noticed that many mausers(always hated the word 'all') have a degree of tilt built into the sights. This is mind I would also check the level of the rear sight and include that in determining level for the front sight. It being more important that the front and rear sights be the same than the front sight level.
