Hack for removing both screws from scale tubes.

[GrumpySoreOldBastard]

The quick and easy way to get that other stubborn screw out of one of those tubes that are used to hold the scales on fixed blades is to get out your drill and insert the open end of the tube into the chuck.
You can get a good grip on the chuck and this makes unscrewing the other screw very easy.
Works like a charm without any danger of marring the tube unlike trying to use pliers or a vise to hold it.