Plus 1 for the flap disc. i have a battery powered 125mm angle grinder, couple it with 80grit discs and a gentle touch, they are very effective on the belly cut.
Just wear gloves, a respirator, goggles and make sure you know where all of your fingers are in relation to the disc at all times. There is a nice little scar on my fret hand middle finger as a continuing reminder for me.





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. The other reason try to remove as much material prior to sanding is I am asthmatic, and always conscious try to minimise myself expose to fine dust.
