Tom never minds publicity !
The prototype for the motor bogie is now available http://www.shapeways.com/model/881479/1 ... block.html
It's designed to be a better running and more robust SPUD replacment.
Everything seems to fit and go together OK but I've not had a chance to complete mine as I discovered I need a broatch to enlarge the holes in the worms slightly so they fit on the lay shaft.
Outside jobs have prevented from locating and ordering as set of cutting broaches but I do intend to get round to it in the next couple of weeks, then I can finish this off.
To know the meaning of life you need not to be dealt a good hand, but rather to play the worthless hand you have been dealt to the best of your ability.