- Universal fit application: This 100% brand new tire changer mount/demount head works with most common professional or DIY homemade tire changing machines. To ensure fit, compare the shapes and measurements on product images with your current item. - Maximizes performance: The duck head mount is designed from high quality metal and plastic. It has a smooth surface to reduce friction, enabling safer, faster, and more efficient tire changes while helping prevent wheel scratching when clamping from inside clamps. - Check before operation: Ensure the mount-demount head bolt and Allen set screws are tightened. Inspect the tire and wheel before mounting. Confirm bead diameter matches the wheel diameter exactly. Forcing a bead seat on mismatched tires and wheels can cause the tire to explode, posing serious risk to the operator and bystanders. - Note on special wheels: Most aftermarket and many OEM performance wheels are reverse drop-center configurations. These wheels must be mounted on the turntable with the hub or wheel-face positioned downward and the narrow side and deep part of the drop center facing upward. - Use scenarios: - In a professional shop with diverse wheel types, use this universal head to speed mounting and demounting of standard tubeless tires. - For DIY home use, mount and demount a variety of wheels while protecting rims from scratches. - When working with reverse drop-center wheels, mount hub-face down on the turntable to accommodate the drop center.