the flexible squares have arrived but we had no luck bending them around to the four quadrant lines on the round timbers....
the best results we have is laying a pair of squares on two lines and letting them cross each other above the timber, so one square is touching on the inside face and the other square is touching on the outside face(the short blades of the squares make an X)
i do like using small nails driven into the lines as a register for the squares
this gives four spots on the four snaplines and the flexible squares work great for filling in the lines between the snaplines.....
I would say again that the round work is frustrating but beautiful stuff
-Mark in ontario