Originally Posted by K_Obeastly
I've never used one but if the o-rings are the only thing really dragging on the pump stroke they are probably there to prevent the pump from cycling on it's own while you run.
Nah, there's a perfectly-weighted return spring, too. Take those o-rings off and you have a buttery soft back stroke with a very positive spring return. For some strange reason, though, they put two small o-rings on the guide. *shrug*