What do you guys use to hold down a small piece of metal you use the plate marker on? I had a half sheet of 4x8 11g stainless that the marker was still moving around on the table, messing up the alignment of the letters. What pressures are you running to the plate marker? I am running no more than 90psi to on board pressure regulator that has the green marks around 30. So far it seems to work better at 20psi from the on board regulator. Also is there a way to lessen the force or speed of the initial down stroke? It seems way to forceful. And finally when does the tip need to be replaced and how?