Husker3in4,
I used J-B Weld, 8265S, it comes with two tubes, one is black the other is white, you will need to mix equal parts from each tube.
Then apply the mix onto the two surfaces, set the position of the TCS and the Flange and let them dry for 24hours.
Remember you are just trying to get the TCS to extend into the Smoker box so that it can get a good temperature reading for safety purposes.
I think the original TCS part extended something like 2-3 millimeters into the smoker unit. I would look at the original TCS you pulled from your unit to verify this...
Your Ground wire question:
Electrical tape would probably not work for long because of the heat of the unit at that location!
The main thing on the ground is the actual wire itself, if it looks good and the wire strands are not broken you should be good.
You can buy heat shrink tubing to cover the frayed wire covering to make it look "cleaner".
Have you actually tried to see if the Smoker with the new TCS installed will come on and heat up?