Thanks for that, Rick.
I have the identical guide but don't use it very much. Nevertheless, I'll keep this trick in mind.
This is a perfect example of something I've preached about for a long time - simplifying the design of a part or tool by identifying the 'essence' of its function.
Once we see that the 'essence' of a wrench is two flat pieces of steel held parallel a certain distance apart and begin looking for something that fits that description, we're well on our way to making the discovery you've shown here.
Enough waxing philosophical; I'll shut up now.

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