What did I take off?

I feel like a dummy. I research stuff to find out how to do things and then I go and do something dumb and throw out everything I’ve learned in my reading, lol. I was changing the oil in the ETX today and I got lazy instead of crawling under and looking better I found a plug and thought I was in the right place. I took it out and very little of something came out. In the pic it’s allen screw right in the middle. Was this just some oil that had settled around this screw?

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