There is a + shaped groove for some sort of wrench. I JB Welded a nut into it. I threaded a bolt through the jar lid. The piece between the handle and the jar is from a door knob. I JB Welded a washer into the narrow end, which in turn in JB Welded onto the top of the pump. The Door knob piece is then JB Welded to the lid of the jar. So, to answer your question, I used a whole lot of JB Weld.What did you use to attach the jar to the handle?