Here's my solution to the occasional drip I get with 2 Lee 4-20 pots.
That's a 1-¼ hardwood dowel, with a 7/8 hole drilled nearly through to form about 1½ deep cavity filled with boolit alloy. Then a pilot hole drilled to thread onto the screw that the original handle goes on. This adds just enough weight to the valve rod to prevent almost all the drips
I don't know what it weighs, way more than my digital scale can weigh,(750 grains). But it works, is solid state,(nothing to fall off, get hot).