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I managed to dissassemble and reassemble the dud torque wrench using this video to help me along
https://www.youtube.com/watch?v=FEZ-ajSksHs
Did some ghetto calibration using 15kg of dumbell plates, garden wire, the crankset on my tandem as an anchor point and plenty of trial and error.
Works like a charm now! Thanks for the inspiration.
Hovis
google "torque wrench repair" and there are at least a couple of UK specialist shops who should be able to fix it for you, worth at least getting a quote to see how much difference there is between fixing it and buying a new one.