Kinda OT: i didn't see a forum just for MAC brushes.
A couple years ago i misplaced my favorite eye liner brush - it may turn up someday, but i'm not holding my breath - i got it in Japan in 1972 and i still mourn its loss. I used that brush with cake eyeliner - pretty much the only kind of eyeliner i used until i lost it.
I like VERY FINE eye liner brushes - as i've said, i tend to tight lining - i don't have enough visible eyelid for broader or smudgier lining.
For a truly fine line, some issues are the diameter of the brush head, the number of hairs in it, and the firmness of the bristles. I bought an inexpensive, fine bent eyeliner brush, white synthetic bristles - and i'm not really happy with it. It's just a bit too stiff, and i think the fibers are perhaps a tad too short. I've been using it with gel/cream liners. I suspect a natural fiber brush would work better. Also, i really do NOT like bent brushes - they REDUCE my control over what i'm doing on my own eyes - maybe they're good for professionals doing someone else's eyes...
Does MAC -- or anyone else -- make a really good brush for fine tight-lining? I've looked at MAC's eye liner brushes on-line and peered at them in the store, but the SAs in my local MAC seem unfamiliar with the finer ones, as they prefer broader lines, so they are unable to give me suggestions i feel confident in. I know i can buy MAC brushes and return them, but i don't feel completely good about that, although i may have to.
Hoping for some pointers. Thanks.