Another note on upgrade:
You need two steppers, two gears (12 teeth, same modulus as used in the mount) or two pairs of timing belt & pulleys (
https://sdp-si.com/eStore/) and PC running Bartels' software (
http://www.bbastrodesigns.com/BBAstroDesigns.html).
$100 max or less if I find suitable motors on some crapyard (Old floppy drives a good source for them) .. This is my plan for the near future. I intend to use existing driver electronics, so I will remove the processor from PC board and interface directly to LPT port of the laptop.