It's important to know that this modification can easily been undone and the mount is again the classic Polarex mount
Bought a Unitron - Polarex equatorial mount 152 with custom made GOTO system by AWR from the UK.
I think Unitron purists will be horrified by the idea of changing this marvelous mounts.
It isn't any longer a real collector's item but a work horse.
It's interesting to see how people are searching to give their classic gear a second life.
You can also see it as a compliment for the versatility of the Polarex system to be able to be updated to the modern standards.