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my first thought is imported chinese trolley jacks from the likes of TWM in melbourne. We have them at work for moving pallets around. Pump the handle say ten times and it lifts up to 2 tonne, click the handle and it slowly lowers the supports. If you mod one so that the base supports the tripods and then make the supports soild against the ground, then i can't see he costs being high. I will check costs tomorrow and post pics
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