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Obtain one of the things with the red cap, or a 14ga x 3.25” angiocath. You can dispose of the inner needle at your local pharmacy in a sharps container, no questions asked. About 3cc is the amount recommended by manufacturers. I’ve got convenient access to this stuff, plus caps for the syringes. If you don’t, maybe a marinade injector coyld work. Or, unscrew the can and pour a capful from a waterbottle or squirt of gun oil on the blast baffle. I use the syringe because the cans are threadlockered to the guns.