>>1879523Belt grinder 300/500/800 grit runs.
Damp cloth strapped down to the red line, hit it in quick length-way bursts until you get the barest resistance (remember it will shrink just a bit more once it's cool again). Re-damp the cloth any time it's getting warmer to the touch.
Repeat at the orange line, but you want to hit it very lightly to the collar sides, across the street not down the block.