Homing switches

Forgot to ask another question. :-)

There are overlimit switches on the Series I. I understand they are
not accurate enough to be homing switches. What are examples of
good homing switches? If I'm going through the trouble of building
the control, I thought I might include this feature. I'm fortunate
enough to have Tom Kulaga (Mr. PC DRO) in my back yard, and
we've met and chatted a bit about a closed loop Stepper system.

Marty