Ignition distributor rotor with an integral hold down spring

An ignition distributor for an internal combustion engine comprising in combination:

• a distributor base mounted on said engine for defining an electrical commutation cavity about a central axis;
• a distributor cap mounted on said base, for defining the remaining portion of said commutation cavity;
• a commutation rotor mounted for rotation within said commutation cavity about said central axis;
• and
• means formed in said rotor for biasing said base and cap in a predetermined configuration to provide said commutation cavity with a predetermined height dimension along said central axis.