I am making a small device to activate the tune function with an AH-4 autotuner and a non-Icom rig. The Icom uses a 4 wire Molex connector. I need to mount the receptable in a small box. The drawing calls for a rectangular hole 1.038" by .312" +/- .005 for mounting. I have a small aluminum box LNB type. What is the best way, short of having one's own machine shop, of cutting this hole? I have only common hand tools available, Dremel, etc.