I use a knot which is similar to the snell, but as I used it originally for spade end hooks, I don't pass the end through the eye twice so hook size shouldn't be a problem; I've used it down to size 32 (yes smaller than 26!) Should point out not using 20lb line
Basically, I form a loop, and align it along the shank (between the shank and hook bend) whip the loop around the shank around eight times, then pull the end (after wetting) to tighten the knot. I found that once you wet the knot, if you tighten it too much before moving it up to the end of the hook (spade or eye) you cannot move the whipping.
This was how I first made hairs. I've no idea what the knot is called, but it works for me.