Several years ago I had an EBay supplier make up (FOC) a laser-cut tool to allow a 1/2" drive wrench ie. torque wrench, to be used. The quid pro quo was that he was open to sell the product on EBay. It works well but a quick search of EBay now doesn't show up the supplier at all. I'm sure that any other of the various sheet metal 'laser-cutting' suppliers on EBay could do the same thing. If you're local-ish to (Hampshire) you're welcome to borrow the tool.
