Sachs 505/1a cylinder head, plastic plug?

Marc s /
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As I'm going over the engine and firing it up, this little plastic plug keeps popping out.

and from my guess/findings is that it's the only place it goes... maybe?

I haven't been able to find a part number for one online, or anything about this little plug that potentially covers the hole.

Looking for input to what this is/ even does, if its even needed.

Maybe the past owner thought it needed one, I'm Lost!

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