I have 3 kayfun pieces 2 are kayfun3.1 and one is the kayfun lite ..can you use any other drip tips on these or are they only used with what comes with in the package? I noticed on the 3.1 original its threaded and on the EhPro its pops on and off but still to small for the regular drip tips to fit ..what do you use on your kayfuns?