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Thinking about making a door handle/lock similar to this. FB door is going to be insulated. Guessing that a sleeve, .500" I'D DOM, probably would be a good idea?
Yeah, you will need some sort of sleeve to resist the twist when it locks down. If you have a couple of small pieces of 1/4 left over from the firebox, just stack a couple and drill a hole and you will be good to go.