To the OP - I guess what I’m most (impressed? confused? in awe of?) with is the patience you apparently have for this project.
Working on some project.
Have a bolt you’re not sure of the size of.
Try a couple different size wrenches.
Some are really close but maybe not quite perfect.
Not sure if they’re a good fit.
Get on your computer, post to the SDMB.
Have no idea how long it’s going to take to get an answer.
Presumably wait for an answer.
Go back to your project hours or days later and unscrew the bolt.
You’re certainly eager to do things exactly right, I suppose that’s impressive in its way.
Personally, I can’t see myself doing that - try a couple wrenches, whichever one fits best, crank away - done in a few seconds.
Your patience is commendable!