I looked at the pedals, and recalled that I did have to install them with an allen wrench, as there are no wrench flats.

I'm sure somebody thought that was a good design, but I disagree.

At any rate, I'm going to see if the adjustable cleats, along with perhaps a washer or two, solves the problem.

I so wanted those pedal axle extenders to be the solution.

At any rate, I appreciate all the suggestions! My wife and I are both getting a lot of valuable information from this community.