The plan called for knock-down tusk tennons top and bottom on the arm, which was to allow the horse to be disassembled to move it, but I figured only one end needed that to achieve that effect, so I decided to just drawbore and double-wedge the head to the arm, and only tusk the treadle for knock-down purposes. This joint matches the ones on my sawbench and workbench, which I like, so I kept 'em going.
Image Central 
