Ta Gav and Joe. I have seen Mel Bartels site but really don't want to spend that kinda cash. Same goes for the AWRtech parts. Tomorrow I will get into my local Jaycar and see what they have.
Have also been told this will work....
http://www.alltronics.com/mas_assets/acrobat/97K004.pdf
An email to Ed Byers is in order too. I have a 3:1 gear reduction on the stepper and worm...most gears are 4:1 which would make sense, wonder if this is an error.
My ideal is a simple handset with slew controls....no computers in sight....except encoders and Argo Navis.