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The Coleman mg9s does not have a screw to adjust outlet pressure on the gas valve. In its place is a spring-loaded pin. This unit comes convertible to propane by flipping around a brass cap that depresses that pin to different depths for propane or NG.

The problem is, the outlet pressure is too low and I need to adjust it.
Does anyone know if the pin can be removed to allow a screwdriver to access the white plastic that it passes through, which appears to have a slot for turning?
 

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Sounds more like you have a gas supply problem, that is not allowing the valve to move enough gas.
 
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