So I was trying out my new Forstner bits (these ROCK for removing knots btw...) and after drilling out the old knot, there were brown speckles all over the previously clean black handle. It almost looked like brown paper towel lint.
I tried lightly sanding with 3k paper, 1k paper, 600 paper... finally I just said screw it and crushed it with some 100 grit paper... It's really scratched up now but I think the speckles are almost all gone...
Is this common? I think from now on I will tape the handle before drilling the knot out, just in case.
Oh, for the forstner, my grandpa advised me that they work best at slow speeds so I turned down the speed on my drill press and it worked a treat.