Just for general information. The pin ("female" hole actually) at 3 o'clock on the probe connector on the electrical cabinet can be hooked directly to a touch plate (a piece of pc board?) and works very well. Unlike the probes/touch plates I have on my Sherline, the capacitance of your skin will trigger it. You will need some form of insulator (tape/gloves) to allow you to hold it. Works great so far. I am sure the factory probe is not near as sensitive to human touch due to it being a 3 wire connection.