Ug, another flat yesterday this time on my road bike. The CO2 inflator wasn't sealing right on the Presta valve so I put the adapter on it, and when I tried to unscrew it the valve screwed out of the tube. I fortunately had a second CO2 cartridge to inflate it again, although the adapter is too tight to get off without the valve coming out so the valve remains open. So I've ordered another mini-pump for my saddle bag. Between banged up cartridge threads and wasting cartridges, and not being able to inflate the punctured tube to find the hole, the CO2 pump is just not reliable enough.