Here's my solution, it has worked well for 50+ miles and counting. I used two eye-bolts with neoprene washers between flat washers, secured with a lock washer. I didn't get a picture, but it sits right on the rear rack. I also should have had a picture of the toe clip strap that goes around the saddle rails and down to the rack which the seat-tube strap on the Carradice Lowsaddle Longflap attaches to.
