1/4" bolt, long enough to have a shoulder or shank around 1/2" or longer
2 nut inserts or panel nuts with 1/4" thread ( not sure of the actual name, see picture
2 beveled faucet washers (should have ~1/4" hole)
Insert the panel nut into the broad end of the faucet washer. Make sure that you have selected these parts to have a reasonably snug fit. This can be verified while at the hardware store
Cut the head off the 1/4" bolt and clean up the cut with a file. Thread the two washer/panel nut assemblies on the bolt with the small diameter ends of the beveled washers facing each other.
You should have a long enough shank on the end to chuck up in a small electric drill. The one pictured is a little short, but still works great.
To use the tool, assemble the facing washers hand tight with a tire between them. The beveled shoulders of the faucet washers should fit a variety of common 1:25/1:24 scale tire sizes.
Fire up the drill and sand away being careful not to sand off all the tread unless that is your intent.. I use a variety of sand paper grits as well as wire brushes.
Edited by Alyn, 19 February 2012 - 10:48 AM.