That's the '91%' part. It's a KFL clone, not just the regular
kayfun. The air adjustment is different & the cap is different where you insert the mouthpiece. Otherwise it's pretty much a KFL+ (which is what I'm using).
When you rewick them, most people use way too much cotton. I heard about that & skimped big time, but after a few builds I found it was still too much. I'll take some pics the next time I rebuild one & make a blog post about it. One of the tricks I learned was after you know how much you're supposed to use, pull off just a tiny bit extra. For a good wick in those you don't want the cotton compressed any more than it has to be. So when you pull off that extra you can really compress it down to get it
through the coil & tear it off when the wick's in place. Fluff up the ends of the wick before you put on the cylinder part of the chimney. Before you put on the tapered part, you can tuck the fluffed up ends down onto the deck (this is where the amount of cotton you used is critical), I just use the drill bit that I coiled on to tuck them down. Prime the wick well, install the taper, check for the top o-ring, install the
tank & fill. The rest is magic.