Where did you find the dowels for size 4 dpn's? I can only find dowels in these sizes: size 3, size 8, size 10.5 and 11. I think that's it. Just the standard inch increments: 1/8, 1/4, 1/2, 3/4, etc., for the diameter of the dowel. I looked at all the hardware stores here, Jo-Ann's as well, but I live quite rurally, so it might be that.