The leak was not bad, just about enough to require pumping every day.
The extra tire that had been following along was taken out of the express office and put on.

It was a tire that had been punctured and repaired at the factory.

It looked all right, but as it turned out the repair was poorly made, and it would have been better to leave on the old tire, inflating it each day.
A small needle-valve was worn so that it leaked; that was replaced.

A stiffer spring was inserted in the intake-valve so it would not open quite so easily.

A number of minor things were done, and every nut and bolt tried and tightened..