Carl, if you have a good drill press it should have a vise block to hold the piece to be drilled, clamp it firmly and use a drill bit slightly larger than the widest dimension of the ovaled hole ... piece-a-cake
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics