if your using the syringe tubing it can be a little hard to get over the orings at first. seems to me they kinda 'work in' so to speak and it gets easier after they have been on with a tube for a while oh and i run a drill bit through the luer lock and slide the syringe all the way on it so the drill will spin the syringe then just use the point of an exacto knife to cut through it. takes a steady hand and you have to make sure the syringe is straight and it seems the back side of the blade point cuts better as it actually removes a small amount of material instead of just trying to cleave through it. hope that helps lol
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