Hmmm... I'm a farmer/make-doer from way back, but that's a tough one. You must have a bigger Dremel than mine, I can already smell the smoke mine would emit if asked to do much 1/8th inch routing.
What about a sharp-thread wood screw, cut off so you have a smooth shank for the Dremel end and threads to cut?
Or Emery cloth folded over a carpenter square edge?
Or parallel cuts with a utility knife and chisel out the middle with a little screwdriver?



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