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I have the CD head knocker on my boat. It includes a ratchet block that allows you to easily control the main without using the cleat.The reason I got this is because I race and I want to play the main in and out during puffs in order to keep the boat flat.Likes: Complete kit of Quality components, including a thread tap for the holes in the boom. Easy to install and easy to use and very comfortable versus the rear mounted main.Dislikes: The mounting screws backed out during the first year ( I race almost every weekend) so I pop riveted the cleat onto the boom. The main sheet hanging down does hit my crew in the head almost every time we tack. I have used CD a lot for parts and they give very good service with prompt delivery.