The thing is, it's not really needed provided you pick good quality homing switches, and mount and actuate them sensibly.

If you have a read of the thread, those of us who fitted good quality optos, had excellent repeatability. Certainly in the couple years I had that lathe, homing accuracy was never a problem. I could re-home in the middle of a job, and accuracy was more than good enough, but it do show up how much flex there was. Even on my bigger lathe that uses the servo index pulse for homing, recutting something after homing will still remove more material, due to flex, not inaccurate homing.