Actually, my first 2 liquinators weren't tough at all. The SS and Delrin were some of the first ones they had. Lots of folks complained because they said they were too "slidey" and would spin on the carto. I don't know what they were complaining about though. They would spin, but only if you turned it. They didn't leak and were easy to hot swap the carto. I guess they bowed down to the whiners though because the aluminums ones I got are real tight. The green one was ok, but this purple one is about to get hurled through a window or something.
