I went to Home Depot with the tire, looking for round things which might
be used to make a mold. The diameter of the wheel that came with the
Mark IIII is 2.58". I found a black end cap with an outside diameter
just a bit bigger than the Mark III wheel. The black end cap has an
inside diameter of 2.38" tapering down to 2.21", and the outside
diameter is 2.72" tapering down to 2.70". I'm not sure exactly what size
of pipe this corresponds to. I also found the white piece, which had an
inside diameter a bit bigger than the outside diameter of the black piece.
Bigger...
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