Hope this is useful for somebody...
I've been mixing my own DIY e-liquids, and seeing that I use a Halo Triton, I've been washing my tanks and coil assemblies an awful lot. (Note to self - Get an MVP 2 and an RDA) All of that washing and drying takes its toll on the wicks. They soon get badly frayed and seem to block the air hole, resulting in a much tighter draw.
The metal coils seemed fine, and it seemed a shame to discard a perfectly good coil, just because the wick was worn out.
There are two wicks in the Triton heads. Both are 2mm silica. I bought about 3 feet of 2mm silica wick from my local vape shop, but lotsa online retailers sell it too. It's cheap.
Replacing both wicks makes the coil operate and taste like new.
The top wick is not threaded through the actual coil, and is usually called the "flavor wick". This is rather loose and it can fall out when cleaning, but it's pretty easy to replace. Unscrew the coil assembly, remove the silicon cap, and the flavor wick practically falls out. The silicon cap is the only thing holding it to the coil assembly.
The bottom wick is actually threaded through the coil. I've never tried to pull this out while wet* (with either e-liquid or water), but I imagine that would be rather difficult. A dry wick comes out easily with no damage to the coil whatsoever.
I cut a piece of new wick the same length as the one I removed. I haven't bothered measuring it - the length doesn't seem to be critical when you're keeping the e-liquid level between 2.0 and 2.4 mL.
Cut a square of 1/2" teflon tape, and roll it around one end of the new wick. You don't want the end of the wick to be at the very edge of the tape square - you want to pull the wick away from the edge about 1/16" - 1/8". When you roll this between your fingers, you'll have a sharp point of just tape. Roll it tightly. It looks like a "wick condom", complete with a reservoir tip.
Let me tell ya, this threads through the tiny coil with no problem. The teflon acts like a lube, and it slides right in**.
Pull off the condom, and throw it in the trash***.
I usually don't need the teflon tape to replace the flavor wick, but there's no reason why the same method couldn't be used.
I've rewicked 6 coils in a row using this method, without fail.
* That's what she said.
** That's what she said.
*** Do I have to spell it out for you?