While I understand the objection about swollen fasteners, I don't think the point is for these special wrenches to become your de facto rusty-bolt removal tools. They're better than wrenches with standard jaws for damaged or stuck fasteners, but by all means, also use heat, penetrating lubricant or extractor sockets, etc, instead when those are options.
Open-ended wrenches wouldn't exist though, if they weren't sometimes the correct tool or the only one that fits.
I think TTI's analysis using soft coupler nuts is about as good a substitute for rusty fasteners as you can get. How else could you simulate it? You might intentionally rust fasteners with peroxide, vinegar & salt like Project Farm likes to do, but can you really trust that the results are consistent? Even if that works for surface rust, wouldn't there be too much potential variation if you tried rusting fasteners heavily?
With the coupler nuts, even though the wrenches all round them over, there's still a difference in how much torque the different designs achieve before the failure point.
Open-ended wrenches wouldn't exist though, if they weren't sometimes the correct tool or the only one that fits.
I think TTI's analysis using soft coupler nuts is about as good a substitute for rusty fasteners as you can get. How else could you simulate it? You might intentionally rust fasteners with peroxide, vinegar & salt like Project Farm likes to do, but can you really trust that the results are consistent? Even if that works for surface rust, wouldn't there be too much potential variation if you tried rusting fasteners heavily?
With the coupler nuts, even though the wrenches all round them over, there's still a difference in how much torque the different designs achieve before the failure point.