Don't know about any "clip" they are mentioning but I had a butterfly screw that holds the blade on the shaft come loose. When it does best case scenario is the screw will travel through an out of the engine. No harm no foul for now. Worst case valves get bent or piston damage. When it happens the engine sounds like a diesel on steroids. I was fortunate to get it repaired under warranty. There are six blades with two screws per blade.
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