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on main gas valve there is a port wit a cap on it marked pilot remove cap slowly adjust screw till pipot flame covers proper area of thermocouple (usually 2/3 ) re install cap on port. NOTE IT IS IMPORTANT YOU ONLY ADJUST PILOT SCREW NOT MAIN VALVE THAT MUST BE DONE BY A TRAINED PERSON WITH PROPER GAUGE
The insert sounds like the cap covering the adjustment screw. Pin hole is for cap removal. Wondering why flame is so high?! Shouldn't have orange flame. If heater doesn't light with lower flame... thermocouple (thing that the flame heats up) may be bad.
there may be an adjustment screw for pilot height. you'll have to look at the valve. a pilot should have an inner cone of greenish blue color and the surrounding flame should be a deep blue no yellow or orange tips. the pilot burns pure fuel no air. the main valve does mix air with the gas in order to burn.