I finally had another look at the Mack today. I picked up a $15 360 servo a couple days back for the screw drive on the box. It is a little slow...OK it's quite slow but it does work fairly well. If I get too bored waiting for it to go up and down I think I'll pick up a drill bit for it but for now it's good enough. Now I just have figure out how to drive the wheels and it will be done
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Reg