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Do you own a Coats 6401 or 6450 balancer and prioritize high-precision balancing? Consider the Coats 8308642 OEM pressure drum. Pressure drums create a tighter seal and more even force on the tire during balancing, resulting in a more accurate balance, particularly for alloy wheels. When used together with the back cone spring (8303639), this OEM pressure drum can further enhance your balancing precision.