Maybe some part of my Grandfather's plane was broken because it seemed like the "wheel" part just did not work at all reliably, or at least that is my recollection from about 10 years ago. This was not a sharpness issue, this was an issue with it being hard to get it to adjust properly in terms of setting and holding the iron (blade) depth.
Given the choice I would also try to buy a plane that has some sort of built in lateral adjustment for setting the side-to-side angle of the blade.
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