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turn the syringe needle up, gently tap the cartridge with your fingers so that the bubbles rise up, then dial a couple of units and let the air out (until a drop of insulin appears from the needle).
If the pistons are uncomfortable, the plastic syringe handle breaks easily enough, you can take out the cartridge and insert it into a metal syringe pen (if you have it), I sometimes do this(when I need to be sure that the piston will not break from active physical activity), but I used to often use insulin in cartridges, not in syringe pens. The only thing I need is to put this nozzle for needle here (I don't know if they can be bought somewhere, I just took it off the cartridge),
on the cartridge you took out of the syringe pen