i just finished reading the 1 star reviews, a few said they were missing parts. the rest were complaining about not being able to figure out how to use it. it's a very simple to use pump. 1 star reviews should be reserved for products that clearly don't work, not having the misfortune to be one of the few to be missing a part, which could even be caused because it was a returned product. Not topeaks fault. The others were complaining about it being to complicated. attach head, lift lever, pump. idiot proof. well, almost.