[nobby2 (Neil)]

My attempt at working through the double split-block sockets as outlined in Krieg and Berry.
Differs from the previous versions in that it uses a 1" channel 1/4" deep through the back of the block (that part facing the mirror box) and uses Two splits cuts horizontally not vertically along the visible side of the block.
The Nylon wing nuts I am using to test will not be robust enough. A considerable force has to be applied to clamp the thin channel of wood around the pole.
Still not excited by the result. Will have to keep testing.