Years ago, not so long, really, there was an adjustment on the gas valve for "pilot pressure". Since the "protect everyone" days, this feature is gone fron heater gas valves. I have a really weak pilot flame which is blowing out often. I have been through the usual steps. Its NOT the thermo couple, its good. I took all lines to burner off and cleaned them. Cleaned pilot orifice whish is VERY tiny. The valve has a srew in the "on-off" knob for main burner pressure. There is a small soft plug in the side of valve by gas line below red pilot lighting knob. Can I knock this plug out? Whats under it? Is the pilot pressure adjust under it? The tank is ten yrs old but otherwise good. I hate to buy a new one just for this reason.