Thanks
Can You "suggest " an encoder and controller setup that would do what you mention. Im not sure where (or How) a Home microswitch would be wired into the circuit to reset-recalibrate.
If not too much bother could you please give me a diag (or lead me to where i would find one) with the encoder wire and microswitch.
I do think those chinese motors would not work as they just too small. I don't want to WASTE time and money . I will have to shorten the ballscrew slightly to fit the wider gearbox in as well

Andy if your still around do you think the new motor link above will be better choice of power for the ballscrew ?