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To reduce the cost of the mechanism by about $13 Australian, why don't you make the centre axle 3mm in diameter (and the other 4mm short axle 3mm diameter) and use up the bearings from the Team Losi Micro pack that we are throwing away? that way you only need one pack of bearings and you can dispense with the need to buy the Mini bearing pack.

Nice design by the way :o) my copy of it is almost complete.