On Mon, 07 Jan 2019 13:32:51 -0600, wrote:

However, grinding out that center will be tricky and time consuming,
since the new knob needs to be centered very precisely.

This recently posted video might give you some ideas on what can be
done:

Cloning Vintage Knobs
https://www.youtube.com/watch?v=aNBHtlhlHF4 (10:45)

I'm really impressed with his results. The list of materials in the
video description section. If you want to go cheap, try Automotive
Bondo and some mold release (or just some grease).

Drivel: The Kidney stones are finally gone after six weeks and three
laser lithotripsy surgeries. Not much pain and no complexications. I
win.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558