?For the mid-section of what I hope will be the super-easy-and-inexpensive-to-make-in-your-shop version, I made a quick demo of the plan for the pivot mechanism (gear will be used but omitted at this time). ?In picture 1, you see a 2 inch Forstner bit being used to drill partially through one of the pieces. ?The center indentation can be a guide for the drilling of the smaller hole in the middle for the bolt. ?Another way to insure a dead center hole is to clamp the workpiece, and change bits without moving the wood. ?Figure 2 shows a nice fit of the 2 inch OD angled thrust bearing. ?After the hole is bored (figure 3), a hole is bored in the other piece of wood, and with washers, and a nut and bolt, the units are assembled. ?For those who do not want to deal with seating bearings in aluminum, this bearing method may work well. ?I just need to make sure there will be adequate strength in the wood.?