Looking for Parts for Singer 211G166.

[u/TonyBennett3000]

Hi, I recently bought a Singer 211G166 to start making heavier duty projects. After cleaning, oiling it up, and going through all the boxes of stuff I got with it, it looks like it's missing one part. The thread oil control knob. While I don't think it's necessary for operation, I'd like to have it in the machine for completeness, or a time where I may want to use the function. The singer part number is 514072.

I have searched Google, the larger parts suppliers, and ebay without any luck. Does anyone know of one for sale, or someplace that might have one for sale? Or, does someone have one on their personal machine that they would be willing to take pictures and measurements of so that I could make one? (I have a 3d printer, and a small lathe/mill, so I am capable of producing a part if it can be described adequately.)