In Roubo’s figure 1 there are dowels on the end of the winding sticks. Do you know why those are there. Also I noticed that you have screws on the end of your winding sticks. What is the purpose and are they related to his dowels?
Great question. The dowels keep all of the parts together and prevent the legs from falling off and getting lost. I'm not sure of they have a purpose beyond that. Mine had screws in place of dowels only because I wanted to put some metal in there for the appearance.
Kudos for using a reference surface to make sure that they were parallel. I wonder if Roubo would have shaped and mortised a large (4" or so) block, and cut the brackets from it