Looks you got everything there actually.. the swing arm the small arm on the side of the big "yoke" parts have a piece that will push on the ratchet die.
You just need a way of fixturing it. The clamps for the tube connects to the ratchet dies and the shoo rides on the inside of the yoke..
Quite ingenious desing having the ratchet integrated to the die. But as well really unique.. never seen it before. =)