well Chris .... sandpaper CAN be your friend! Last night I was working on a piece of cherry burl (a surprise pen for my wife) and it has a nice knot in one of the barrels. Now I knew it would be a stuggle, and as expected the little knot popped out.
A little CA, pressure, and coffee grounds to fill in the gaps and I went back to work. I used my 80 grit "skew" to whoop that knot back into its place!