I've got the same problem with one of my Zefal HP-X pumps. The one that's broken is a size 4 and that's the length I'd like to use on my touring bike. I also have a properly working HP-X that's a size 2 (bought at a swap meet for $2). Is there a way for me to use the good parts from the smaller pump to fix the larger one? It's not clear how the handle should be disassembled.