... those silly little metal retaining clips. I lose one every other day it seems and betterbottle makes you buy a whole repair "kit" just to get the clips. does anyone know: a. a source to order just the clips? what is the size, part number, etc. b. are these stupid things even needed? it doesn't seem to me that the parts they are supposed to be retaining are really under a great risk of accidently dislodging?