But now I have an additional question. I have found that cone wrenches can be made in a single size jaw, 13mm, or in a double sized jaw , 13mm and 14mm, etc.

Is this a good or bad idea?

How does this work out in practice?

Is it better just to stick with the single size jaw and avoid the stresses put on the bigger jaw located out at the end of the jaw where there is a lot less metal to take the stress of a reluctant nut?

Thanks for your advice and thoughts.