Alligator clips, with a bit of heat shrink tubing melted on to the upper and lower jaws for traction, work well for me.
They are alot lighter than standard hackle pliers, and you can make a bunch of them cheaply. I prefer them to my standard hackle pliers when working with small hackles (#22s, #24s, etc.).
or
spend a bunch on "good" hackle pliers. I think I have dr. slicks that were like $30 and they give and swivel when the human hand applies weird pressures.
Some people hate them, but I've switched to the clip style of hackle pliers, and they do a great job with small hackle, and they're cheap ($3.95). You can get them from Feather Craft here's a link to the page: Ez Mini Hackle Pliers
i bought my first one from feathercraft. still use them. i bought 2 back-ups at radioshak for about half the price and use one of them to hold a small fly when tying it to my tippet
"Some people hate them, but I've switched to the clip style of hackle pliers, and they do a great job with small hackle, and they're cheap ($3.95). You can get them from Feather Craft here's a link to the page: Ez Mini Hackle Pliers"
I've been using these for decades, work fine for all size hackle.