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Hovis-
I can kinda tell @mdcc_tester can take it apart and put it back together without having spare bits left at the end.
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This does not fill me with hope that I can mend it.
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.
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Contact Draper, I'm sure you're not the first to have done this.
Clockwise
gbj_tester
Constable_Savage
There's where you went wrong. Unwind to the last line above zero, so that you keep a small amount of tension on the spring to hold everything in place. It probably isn't broken, just something has become disengaged because it had no tension, probably around the cam/pawl or pawl/arm engagement if that's the type of mechanism, but other mechanisms are available, e.g. toggle links
