For mine I bought a low wattage one from harborfreight (orange handle , maybe 30 watts ? ) drilled a hole in a cleaned out soup can on the side near the bottom about the same size of the barrel of the soldering iron . Then I took out the screw that holds the tip of the iron , put the iron into the hole and then put the screw back in and that prevented the iron from falling out of the can ( or the can falling off the iron , if you want to look at it that way ) I think it was a condensed soup , I used it because the metal ring of a canning jar ( smaller jar ) fit on it just right when I stretched aluminum foil over the top of it . Then I throw in a handful or so of chips , stretch foil over the top , put the canning jar ring on ( I'm not sure if that's the correct term , the part that screws on the jar to hold the lid on ) , poke some holes in the foil , and place it in my smoker as close to upright as I can get it ( in my smoker I have to have it slightly tilted ) and plug it in . I used mine for cheese I'd leave it plugged in for an hour and then I would unplug it and wait another hour and then remove the cheese . Mine worked fine . Just keep the handle as low or lower than the bottom of the can , if it was higher than that I think the handle would probably melt . The can gets pretty hot so I never reloaded mine . I never had the need I suppose , because the method I used and the timing made it the way I liked it . It's a pretty cheap way of doing things .
I started with a new iron that I put in the smoker and plugged it in (the iron ) for an hour or so just to burn off any residual stuff that may be on it (mainly oils or whatever ) and after I drilled a hole in the can I baked it for an hour or so at 275 just to heat off any residue or whatever . I'm sure someone may say something about toxic things coming off the iron itself but I figure if you use it to solder up a circuit board or something you would be exposed to it's hot tip so I never really thought of that until now .
One last thing to note , the top of the can where the lid was removed could be sharp , so if you are washing out the can don't put your hand inside it trying to clean it without doing something with the sharp edge . I actually think if you rinse it really well as soon as you have dumped the soup out , it wouldn't need to be washed because you're baking it anyways .