There is no need to replace the element with a liquid smoke kit. The original style elements work great with liquid smoke fluids. And as some of the above posters have indicated......any kind of shim that will fit behind the lever will tighten it up. Styrene. cardboard, thin washers etc. I, for one, never move the levers. I prefer the option of getting all the "gears". So, that shim will never move.
Roger
