"The first item of interest was that the diameter
of what might be a tire appeared to be roughly
36 inches – the Goodyear Airwheels on Earhart’s
Electra had a diameter of 35 inches."
Now, Gary, your reference to the main landing gear tire being of diameter 35 inches now presents an entirely new problem:
My measurement of the ratio between the bottom (horizontal) edge of the worm gear to the full diameter of the tire appears to be 7:12. If the tire were 35 inches in diameter, that would imply a worm gear measurement of 20.6 inches.
However, using a real scale (in inches) you can see that the comparable length of that radius, taken from a bonafide L10E spare worm gear, is a mere 14.5 inches, or at least 41% less than the dimension one would expect.
I conclude, therefore, that the declaration by those at TIGHAR that the Bevington object is actually an Electra landing gear, is now highly questionable. YMMV.