The Pinewood Derby Car PRO Hub tool performs three
important wheel preparation functions:
The PRO Hub Pinewood Derby Tool has a square end to improve wheel
hub accuracy
and a coned end to reduce hub friction.
Hubs can vary in size as much as .01" in molded wheels. This tool
will allow you to ream the wheel hubs all to the same size
or help in selecting 4 wheels with similar hubs, this is one of
the most important steps in alignment because it allows the car
to sit square with equal radius's on all wheels.
Test fit each
wheel by sliding it onto the tool pin. If the sheel bore is too
small for the tool, use steady hand pressure and a twisting motion
to work the wheel on to the tool. Remove the wheel and repeat
3 times.
This tool can also be used for coning the wheel hubs. All Pinewood
Derby cars will benefit from coning the in-board hub for a reduction
in body to hub friction. This tool makes an even, polished cone
that reduces body contact by 95% and can even be used to polish
in graphite by adding a small amoujnt in the dished end after coning
for even more friction reduction.
Dip the coarse grit sandpaper (included) in a cup of water. On
the square end of the tool, pierce the sandpaper (grit facing
outwards) and slide the sandpaper until it contacts the body
of the tool.
Place a wheel onto the square end of the tool, hub side first.With
one hand hold the tool and the sandpaper. With the other hand,
press the wheel against the sandpaper. Rotate the wheel back and
forth for about 10 seconds.
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