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A Diagram Showing Someone Holding a Rubber Shaft Collar in Their Hand For 15-30 Seconds to Warm It Up
Using your hand to warm a Rubber Shaft Collar

Rubber Softens as it gets Warm

Hold the Rubber Shaft Collars in your hand for 15-30 seconds before you slide them onto a shaft. Holding the Rubber Shaft Collar in your hand will warm and soften the rubber to make it easier to slide onto a shaft.