Building a better Guinea and Feather

Step 11 Pivot block

The two tubes are clamped and held in place by the pivot block. The whole assembly rotates about the 303 stainless steel dowel pins which are in turn clamped to the aluminum support tubes. After I took these pictures, I drilled a hole in the front face for a 1/4"-20 set screw to prevent the dowel pins from rotating without the pivot block. I also milled a flat surface on the dowel pins for the set screw to hold on to.

Before inserting the dowel pins, cut two short lengths of tube and turn two aluminum donuts to provide support. Acrylic can be brittle and could break if too much pressure is applied when pushing in the dowel pins.