Most if the responses on here pretty much cover it, best bet would be to go with a rebuild using either a cotton ball wick or just some normal wick. But if you think your not ready, than just pop off the rubber seal from a new, unused head, pop off the long metal piece that holds the wicks on, pull the top wick off and replace the metal piece and seal. Works like a charm and it's not too difficult. My protank heads sometimes were just a little finnicky at the beginning but got better with time, just play around with your options, it'll work out eventually!