1893 spanish mauser barrel change

[vintage hunter]

Have yet to encounter a traverse pin in the front sight band of a Mauser but there is an index screw in the base dovetail under FS blade and in the rear sight base, sometimes it's under the ladder spring. Not all are soldered, some are a pressed on and retained by the screw.
It's not rocket science to heat and turn the sights but it's not a job for the inexperienced either, there a bit more to it than heating and turning. It's a two man job, one to heat the part to just the right temp and keep it there while the second turns. Get it too hot the solder starts bubbling and spattering then runs out like water, not hot enough all the way round and the sight can easily be distorted.