[quote=samc99us]Key balls are expensive and not universal. They are also slow to unhook.
Folks knock can't miss rings but they are good enough for the Goodall team riders, relatively soft and easy to use. I like them.
My favorite setup though is the carbon block/ring system as shown here: https://get.google.com/albumarchive/113104871781736070750/album/AF1QipMvkUJZQ3SPrZVNM52ofZkT_jEjzN_7EC2Us-yH/AF1QipNs5YmZ_ng_AzFT8F00idOMUptj8B0xc6TORkAd
Those get sucked up into the double roller block so the ring can't swing around. Nacra, eXploder and others have them. Murrays has em in stock.[/quote]
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