Sanding pad of 120 grit on a 4.5" hand held grinder does a very good job.
This
quench
oftenI have to deal with Mesquite stumps, below grade, on a pretty regular basis.
......all of the traditional niceties are reserved for a Norlund I bought in Canada in 1975 (that still wears it's original handle) and a coupla' favorite hawks.
......a WORKING axe, that's used almost daily ? ....Hand grinder and a bucket of ice water,....maybe finish on the belt sander.
GTC