Re: Bobbin cradle
The Bobbin Cradle is positioned to hold your bobbin, only when using the rotation feature of your vise, or, for anytime, you want both hands free.
As pictured, below, the bobbin is in the correct position for rotary tying.
When you're ready to rotary tie materials onto your fly, half hitch, or whip finish about two turns and then pull enough thread from your bobbin to lay it over the black plastic "thread wheel" of the bobbin cradle. This keeps the thread from "winding up on the hook shank" as you rotate the vise, applying your materials.
By the way, the picture shows the "thread guide/wheel", quite a ways from the jaws of the vise. This distance will become a personal preference really and will also depend on the length of the hook you're tying on.
Have fun!
Paul
Saint Paul-"The Highly Confused"
You cannot do a kindness too soon, for you never know how soon it will be too late.
-- Ralph Waldo Emerson