Eventually I am going to have to make a bunch of spool clamps to glue the top back on of the 1939 C1 I acquired. Couple questions on the clamps. Will 50 be enough? Will 5/16" 18 x 12" be a good size? Thread rod or long carriage bolts? Large round wooden dowel cut into disc' or plywood cut into rectangles. Cork as a cushion?