Head on EDC AAA way too loose

Photon · Dec 14, 2012

I carry a 4sevens Preon Revo on my keychain. The head is way too loose. Sometimes I take the keys out of my pocket and the light is on. If I loosen the head more (to prevent accidental turn-on), then it is likely to fall off.

I thought maybe I could clean the threads and use a thick grease.

Any suggestions or recommendations?

Thanks.

Onthelightside · Dec 14, 2012

What kind of batteries are you using?

NCF8710 · Dec 14, 2012

It's possible that your O-ring is worn. Try replacing it with your spare.

Danielight · Dec 14, 2012

You might also try some Teflon tape on the threads. That would add a little more thickness to the threads, but still allow for smooth twisting.

shelm · Dec 14, 2012

use silicone grease on the threads AND the o-ring

oKtosiTe · Dec 14, 2012

shelm said:
use silicone grease on the threads AND the o-ring

But check that the o-ring is not made out of silicone itself.

reppans · Dec 14, 2012

Before I knew better, I used Vaseline on one of my lights and it expanded the o-ring. Except now, it's my favorite o-ring and keeps the head on my light nice and tight (silicone lube since). Not sure how repeatable it is, but I was recently thinking I should make some more fat o-rings for a few other lights. I got spares in case it doesn't work.

Photon · Dec 14, 2012

I'm using Krytox for thread lube. Some CPFers gave favorible reports for it.

The AAA is either an Eneloop or Eveready Lithium. Same behavior with either.

I thought about using Teflon tape to stiffen the turning a bit, but wouldn't that interrupt the electrical path?

Replacing the O-ring is a good idea. Get one the same diameter, but thicker. Anyone know the diameter of the O-ring for the Preon Revo?

Head on EDC AAA way too loose

Photon

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