Repairing a Thermador Double Oven Knob

I own an electric Thermador Double Oven - Manufactured 1994.

One of the plastic oven control knobs keeps coming off. The internal plastic hole has worn away and is too loose to fit the metal stem.

I have not been able to find a replacement because of it's age. I've tried the manufacturer, appliance repair companies, ebay, online, etc

So at this point unless anyone has a better suggestion I'd like to simply glue or use putty to get the knob back and operational.

My question is:

1. Is there a good adhesive to withstand the high heat of the oven
2. Is the adhesive strong enough to work - gripping and turning the metal stem?

Thanks

via Repairing a Thermador Double Oven Knob
by bvgas