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So is the npas is an aluminum nozzle or that adjustable bulb? If it is the aluminum nozzle then check your spring. If its tapered then you have the latest "version". If its a straight spring then remove it and toss in the spring from the plastic nozzle. If its the bulb style then you have the same issue mine did. One mod you could try is (if your brave enough) sanding down the base it sits on. There should be two little nubs on the lower half of the plastic nozzle. Or try stretching the spring.
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