[NewRedRider]

Give us a wider picture for reference to its location.

 

[NewRedRider]

That's good enough. I have nothing on this and neither does Ronayers.com. Looks like an oil drain back plug or something. Not really sure.

 

[NewRedRider]

Maybe some kind of drain? Perhaps gently unscrew it and see if it comes out easily. Probably needs some kind of sealant when re-installing.

My luck some kind of spring and ball set would come flying out across the room.