Original poster: "Gerwazy WP by way of Terry Fritz <teslalist-at-qwest-dot-net>" <hardtmutha1-at-wp.pl> Hi, I have bought a nst 10/37 made by tecnoservice, maybe someone know them. And the question is that as everyone says i should ground it, there is a screw to plug ground cable, but i dont know how it will work, should i use it or not ? hardtmuth.