Depends on how old it is. The early ones are loctited in, and I wouldn't recommend removing them, as they're dead hard to loctite back in. The newer impulses (certainly from vision onwards) have screw threads - just be careful u don't strip those threads on the way out, or else it's new body time (or lots of STRONG loctite
)
Better to scratch the old feedneck on the way out than to have to fork out for a new body.