I have two family era (Joel Era with the "Fish" logo) pipes. Both have the stingers in place. The One Dot's is whole, the Four Dot's stinger has been "chopped". Are these stingers screw in types, or were they fixed in some other way? I think I know why the previous owner chopped the Four Dot's stinger. I used padded pliers to try and unscrew it, to no avail. It wouldn't budge! A pipe cleaner will now pass through to the bowl, unlike the One Dot with stinger intact. How do I go about removing them?