lamp coat hook

I wanted to put a coat hook on my cheap lamp from walmart. The lamp has a 16mm diameter tube.
I used some bolts that I had leftover from furniture, which were about 6mm in diameter.

I designed this with OnShape: https://cad.onshape.com/documents/26251f0e224912ce8d50dd76/w/26f4b8dffc754d3399ddfab5/e/ed8f6c37424b0490e7a2238e