I saw the some filter and primer units on tower, either the ofna one (http://www2.towerhobbies.com/cgi-bin...?&I=LXEYG3&P=7) or an integrity one (http://www2.towerhobbies.com/cgi-bin...?&I=LXRJL0&P=7). I'm worried about the size of the primer though, it looks a bit small, would it push enough fuel around? then again, the primer on my original tank probably wasn't very large either. i like the ofna one cos it comes with a bracket, although i have no idea where i'd mount it. anyone tried those filter/primers? do u have to squeeze it thousands of times just to move enough fuel around?