There's a huge lubrication thread on CPF. Lots of information and probably some misinformation too. What I took away from it was that the optimal lubrication depends on what material / metal the light is made of. So the answer will depend on which Logan body you purchased. Also, be aware that different o-ring materials react differently with different lubrications. Nyogel, for example, may be good for threads but it will deteriorate EPDM o-rings. I do not know what Peak o-rings are made of -- I tried asking in a different thread but no one replied.
Here's the chart I cribbed from somewhere in that mega-thread (direct link:
http://www.candlepowerforums.com/vb...ube-Thread&p=3210846&viewfull=1#post3210846):
For ALL METALS in lightly loaded and only occasionally used threaded assemblies (like tailcap threads) all of the following are acceptable:
Mobil One [Red] Automotive Grease, Nyogel 760, General Purpose Lithium Grease, Generic Teflon Grease, or Krytox
For critical applications, not all of these options will perform equally, so here are how they stack up:
BARE ALUMINUM
In frequently used or heavily loaded threaded assemblies (twisty lights)
BEST – Mobil One [Red] Automotive / Synthetic Grease
GOOD – General Purpose Lithium Grease (universal coulpling grease works well)
MARGINAL - Teflon Grease, Krytox, Nyogel 760G
STAINLESS STEEL, HARD ANODIZED ALUMINUM
In frequently used or heavily loaded threaded assemblies (twisty lights)
BEST - Krytox (note: Though always best on Stainless Steel, Krytox is only best on hard andodized surfaces while the anodized coating is intact. If the anodized coating wears through, Krytox goes from BEST to MARGINAL because it will start to cause fretting and wear on the exposed soft bare aluminum surfaces.)
GOOD – Mobil One [Red] Automotive Grease, Lithium Grease (universal joint grease)
MARGINAL – Nyogel 760G
TITANIUM
In frequently used or heavily loaded threaded assemblies (twisty lights)
BEST – Krytox Grease (no sodium nitrite)
ACCEPTABLE - Krytox Grease (with sodium nitrite)
MARGINAL (light loads only) Mobil One [Red] Automotive Grease , Lithium Grease
Thanks for the heads up guys. After removing the Small plastic ring from the bottom of the Duracell primary i'm using the light is plenty bright enough. The ring was causing havoc to the qtc.
Wouldn't want to risk that kind damage if I'm honest.
I put a little teflon grease on the threads as they were dry. Not sure if this is ideal. What do you think?