Door Reassembly, Vent Wing Adjusting Rod Retainer

There is supposed to be a retainer to keep the vent wing adjusting rod in place. There is a very sketchy representation of it in the FSM. I don't have any such thing in my bag-o-parts for either door from when I disassembled the whole thing. I don't even know what I'm looking for. Can someone show me what this retainer looks like, and better still, where I might be able to find one (or an acceptable substitute).

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