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I was wondering if this firebox gap is worth fixing and if so what should I do? I am planning on doing another thermometer lower right and a tuning plate should I do any gaskets?
Agreed, any leak is worth fixing. The tighter the system, the easier it is to control, especially when burning charcoal or wood. A tube or two of high temp RTV silicone ( copper color,) or fireplace sealant will cure a lot of leaks. Just clean the area well before you apply. Rubbing alcohol works good after a de-greaser. Gaskets on the firebox are a good idea in book - again it is about controlling the air flow. On the grill door is up to you.
I have a Horizon Smoker that has a small gap like yours. The Horizon with the 1/4 inch steel holds heat so well that the small gap does not really cause
A problem since you need a little air to get through so the fire does not go out. I left mine like it was and it is an awesome smoker.