The bow height is from the center of the edge of the chrome trim around the body opening for the top to the center of the rear bow. In your case it's 20 1/2". Yes, it falls backward to open the top, but the key is making the rear bow stay at that length when the top is up, not going down. You set it at the correct height with the top's frame completely up and latched. The pads are stapled to the rear bow as well, and they will hold it at that measurement. The opening in the top is centered on the rear bow, and then the wire on is put over the seam.
T-50 staples, plain or stainless are available at most home centers. I got those at Home Depot.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 06-13-2012 at 11:24 AM.