jlolothe O rings go (generally) wherever the body separates, usually at the tailcap and where the head threads on. Keep them someplace you can find them; tho most lights have some sort of "storage groove" on the body, I find they get rolled off and lost as the light goes in and out of my pocket. They seem to eventually dry rot, whether you use the light or not, so I try to keep the spares in an airtight container (35mm film canister leftover from days of yore). sorry for the late reply...tho I'm curious: did you end up getting in on that drop and, if so, whaddaya think of the light?