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thanks Ray, i have spent the morning looking up tech drawings of the mount and the ota, doing the calculations and it seems that the standard weights are probably not going to cut it. the extension bar seems to be the bes way to go, when you look at what an additional weight does to the capacity, i.e. it moves the centre of mass of the counterweights up the shaft, so adding weight doesn't give you a whole lot more capacity. the extension bar with no additional weights increases the capacity dramatically.
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