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Link to the rules

http://mafca.com/hub_rules.html

part of the rules:

The Cars:
The cars must be metal 1:20 scale models made by Hubley, Gabriel, and Scale Model.

Any of the seven Model "A" body styles may be used: Sedan, Station Wagon, Coupe, Roadster, Roadster Pickup, Victoria, and Phaeton.
Cars must be stock including the original tires, wheels, and axle screws. No modifications allowed.


Steering may be secured or loose at makers choice.

Weight of each car can be no more than 1 pound, 5 ounces (station wagon weight). A small amount of leeway will be allowed due to the differences of scales. Weights added to lighter cars must be secured, not loose in car.

A dry lubricant (graphite for example) is allowed at owners choice.