Does anyone use Novarossi glow plugs on the Ninja engine (.21)? It seems that although the glow plugs are more similar to the Mega plugs (threaded part stops 1mm before the taper), the head button has threads all the way to the taper, similar to the Novarossis! I test fitted the three types of plugs (Ninja, nova and Mega) on my Ninja engine, and all seem to fit!