So i got a 10ML syringe with a 17g blunt nose needle and figured i'd try refilling a cart with it. I have been using taryn's spin method and it worked FLAWLESSLY, but I find the needle gives a slightly more easy/quick way of doing the filling. With the spin method I would drip 10 drops in, spin, drip 10 more in, spin, and drip 10 more in and give a final spin. I suck up 1ml of juice in the syringe and once the bulk of the juice is in the cart I give it one whirl in the batt bag and remove it. The top of the batting is now dry so i top it off. I used to get some gurgling from juice getting down in the center post using the drip method but using the needle this hasn't happened. just my 2 cents.
i never even knew because i have only previously only bought them for doggies. but i think these are prob the exact same thing as the ones for people. *roll eyes*