Kevin,
You can lift the wheel set out of the truck. Sand/turn off the lip that holds on one of the traction tires. Press on the metal tire. Done.
I have not checked to see if there is tubing out there that is the right size to make a traction tire. I just cut mine out of aluminum on a lathe, which I understand many people do not have access to.
John,
On what wheel would you install a wiper? The fronts are not making enough contact with the track and the rears have traction tires.
