Rotatable drawing holder

This is something that we plan on building when we transfer to the new production area, super useful for us because we always have a big number of designs in production. The OSB sheet is 15mm thick and it will be applied on both sides with bolts running thru both sheets in the same place, the spinning is done by machining the end of M12 bolt down to 10mm or a bit less and a simple hole thru the tube with the nut welded inside the rotating part...