An update and a cry for help!
Since the last post here, I've finished my scratch built CNC machine, controlled by the Arduino and it seems to be working fine. I need this to cut the gears for the clock. I managed the electronics because I simply followed other peoples Arduino projects.
However, I've not got my head around the electronics for controlling the clock, despite the friendly advice I've received. I'm really a wood builder rather than an electronics guy.
In the meantime I've emailed the original builder of the micro-controller circuit, hoping to buy a complete