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This tailcone is designed to be used with my custom 50mm clamshell heatsink. Testing has shown it to reduce peak motor temps by 25-50 deg F when compared to running the motor for the same duration without the tailcone installed. Heatsink is simply installed by placing the vertical tabs between the two halves of the heatsink and then tightening the heatsink screws to secure in place. Make sure to guide the motor wires through the neck before installing the tailcone in place.