I have tried just about everthing on all the forums for the best filler or mod. I think the best ( I can go amost all day without refilling ) that I found is Scotch Brite ( blue not green ). To refill I pull it out with clip or twezzers put in only 6 drops or so and vape away. You could also use a inkjet needle without having to pull out the filler. Protege is one of the best if not the best. 
