I'm planning to do a CNC conversion on a HiTorque Mini Mill from Little Machine Shop. The first mill conversion I did was a Proxxon MF70. For that one I used mechanical limit switches. The stepper motors are small so in the event it doesn't stop I can, with a little difficulty, back off the axis lead screw enough to free so the motor will move the table. For the new conversion I was looking at high torque NEMA 23 motors. I'd like to try something little more reliable than a micro switch one each end of the axis. Am I overthinking this, or is a "good" mechanical switch reliable enough for a mini mill? What is being used out there with self converted CNC mills?