Hey a follow up....
I've been using this vise now for just about 3 years. It's a nice little vise for small work. One problem though
It bolts to the front of the bench which means its always in the way and it takes up valuable space when it's not needed.
Then another youtube superhero of mine Steffan Pahlow. He mounted his to a fairly large lump of brass round stock......genius!
at 5 pounds, this vise is not going anywhere for normal uses.
I ordered up a 4" round off the bay and drew up my version of this and built it today. It works great and I can just park the vise at the back of the bench when not in use.