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Are you talking about the plastic cap at the end of the injector? Or are you talking about something a little more serious? If it's just that small cap at the tip of the injector, it will be fine to use.
Well I pmed ya what I did. But just remove the cap. All its there for is to protect the pintle of the injector. Just be careful not to drop the injector or anything after its removed and youll be fine.