Quoted from High_End_Pins:Find a wooden dowel that fits in the post hole tight,flush it to the playfield.
Get a nice sharp forstner bit the size of the t nut
Put the pinpoint of the forstener in the center of the dowel you placed in post hole run the drill backwards slowly to cut the clear and into the art.
Ok, now this is frighting, I really was thinking of this method. REALLY. +1