Here are micro switches for replacing failed switches in mouses.

 

So, it appears that the front motor is used for focus (moving the front element group) and the back motor of zoom (moving the zoom group). Since the is no visible feedback mechanism I assume it used an autofocus system. Since there is no limit sensing, it must have used over-current to detect end of travel.

The best way to adapt this would be to turn the motors into servos of the simplest kind by adding position sensing and some circuitry to allow PWM control—like a hobby servo. This would allow the use of two knobs that would always move the elements to the same position for any particular rotation.

Though relatively simple for someone with a clue, it is certainly more complicated than a pair of switches. But it would seem to be very challenging to achieve sharp focus with a switch like that. I can imagine it being very frustrating shuttling back and forth past focus until you managed it.

Thanks Ya'akov, for the input

As you might have figured it, it's just a zoom lens setup with a C mount attachment to the actual camera. I have the microscope camera and have the fine tune, focus, and some other features in it. We can control the camera either by provided remote or on-screen pointer.

I need to get a rough zoom position by tweaking the front and back units, then fine-tune the camera.

Can you explain your idea of "The best way to adapt this would be to turn the motors into servos" pls?

 

I have a few video cameras that have zoom and focus adjustments controlled by momentary switches, rather similar to what I described. there are no problems with getting into focus. A microscope will probably be different, but if the speed is not excessive it should not be a problem. So it might need a PWM drive so as to have enough torque without the speed. A fixed speed PWM drive just for the torque.

Yes Bill. When I tried roughly after fitting everything together, it was working fine. The motors will work fine with 12V 1A supply.

Regarding the speed of the motors; they are designed to do exactly the purpose of high torque with slow-speed gearing.

Here only difference is, that I'm trying to eliminate the control circuitry and wiring harness because that needs an external controller. For my use, a simple wiring trickery will do as suggested by Tonyr1084

 

As promised:
View attachment 331832

I think this looks promising with the micro limit switch setup.
Thanks Tony