I use the electronic mini grabbers for holding flies while tying them on as well as for hackle pliers. I get a piece of fine emery cord & round off the edges for the ones I use for hackle pliers. If you have a problem with the standard ,or the old English style hackle pliers try gluing a small piece of fine emery paper to one or both jaws. It adds some gripping power without damaging the feather, tinsel or floss..

Neil