i am in the middle of a retrofit of a hardinge chnc4 lathe.moving right along,x and z axis have e6d us digital encoders installed with gecko 320s.ab 1336 impact vfd with 7.5 hp motor.reading of others and their trials and tribulations with the tool turret, controlled it by geared head stepper motor with gecko 201 and a 5way solenoid air valve. can anyone recommend an optical switch for the lathe index pulse? i cant mount a slotted disc so it has to be reflective. thanks