A welders chipping makes a great handle for just about all applications. Or in particular , the spring on the handle. For a rotation handle (like maybe a firebox door), just cut the hammer part off, heat the shaft, bend it like you want it, then weld it wherever it belongs. For lifting handles (like for the smoking chamber door), cut the spring away forn the hammer (easy w/ an angle grinder), maybe use 2 or 3 springs, buy a piece of steel rod, slide the springs onto the rod, heat and bend the rod into shape, then weld it in place. If you make the handle to where it stands 5-6" away from the smoker, it shouldn't ever get so hot that you need a glove to use it.
Just my two cents, it's worked on a few rigs that I've built.
Tim