Btw, an update...
After suggestions below and PM'd to me the decision was between
FocusStarPro by Cercis Astro
SharpSky
RoboFocus
Before Christmas I ordered a SharpSky and am expecting delivery any day thanks to friendly, prompt and helpful service by Dave @ SharpSky. I'm looking forward to trying out a new focuser, see how it compares to the RoboFocus
