Well Argos don't sell spares for torque wrenches do they whereas a tool, yes that's a tool supplier might actually be able to buy spares in for you, because they deal with the manufacturers and trade suppliers, plus it would save hours of Internet trawling.
So, in summary, your the stupid one for thinking Argos sell spares, we all know they don't so why would anyone, apart from you call Argos for any spare part.......stupid
And further, reps and manufacturers don't deal with the public unless you have a trade account do they now poppet......
and say what? excuse me break a 70 odd pound torque wrench and sell me the 1/2" drive for 12p?
I'd email your manufacturer of your torque wrench or if they have a rep here speak to them.
They might sell spare parts......stupid