I am using very cheap servos so I tried some larger digital ones but they are no better so I am now experimenting with stepper motors instead, see - <a href="http://youtu.be/wBOTbSKWDwUJust">http://youtu.be/wBOTbSKWDwUJust</a> wondering if there is some clever way to make the joint bearings as at the moment I am just using some small nuts and bolts but of course there is a lot of play in them.......I suspect there will be some plastic joints/