I searched around and couldn’t find any posts about this, nor did I see this ebay user’s name on the blacklist so I thought I toss this out there as an FYI as sources for Ion Knobs are few and far between.
This is a ion knob machined out of plastic as described in the auction. Comes painted and with a bolt. Bought it off ebay and had in hand in 3 days.
Now, I’ve never seen a good, machined aluminum one in person to compare with (and I’m sure aluminum would trump this), but for $25 shipped it looks pretty good to me and will work for me.
So if you need an Ion Knob and don’t mind plastic, you can find it on ebay.