airbrush not spraying with needle cap off?

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Lack of pressure once the nozzle cap is screwed on

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How the he'll do I remove the nozzle cap and needle cap. it's like they are glued to the airbrush. Also how am I meant to use the tiny aah spanner to

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Double Action Airbrush Kit, Trigger Air Brush Spray Gun with 0.3, 0.2, 0.5mm Needles, 3 Sets Nozzles, Air Cap, 2cc/5cc/13cc Paint Cup, Air Hose, for

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