Universal Extension Wrench

something along this line looks like it could be made with sufficient robustness to transfer sufficient torque.........
Thomas C. Wilson - Right-Angel Worm Gear Drive
That's a professional looking piece of kit, which won't cost £10.
Were I a prfessional and took the piece of kit that I've bought onto a 'professional job', they might escort me off of it!
Horses for courses, as they say.
 
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