What are you using to clamp around it for the lanyard setup?
Two #62 O-rings around the barrel of the mod (although this pic shows 3, but I found that 2 are sufficient), with a #40 o-ring folded through them, and a 1/4" split ring through that small o-ring to secure it.
For you Provari owners, two #40 o-rings should do the trick.
And for eGo batteries and CE5 clearos, two #10 0-rings fit the bill...
I have a new lanyard with a smaller, metal lobster claw-style jewelry finding for the clip.