The maker of the Jvice has now made a hackle plier,
I received mine a week or so ago.
It holds like a bulldog!! And is made very well.
It can be put around your vise stem and it becomes a third hand.
Really like it!!
First photo is a prototype, second is the one I like the best and am using.
http://i1101.photobucket.com/albums/...psa18b5142.jpg
http://i1101.photobucket.com/albums/...pse5a70ddb.jpg