Forgot to mention I got one from Arc EuroTrade
http://www.arceurotrade.co.uk/Catalo...ng-Accessories About half way down... The 4" with the stepper pre attached.

I think Kip thinks it was expensive for what it was, but at least I get to use it straight out of the box without having to design / make / wait on parts to get a stepper on it. Quality seems ok, and it weights a ton and a half.

Dave.