This only works on a rack with about an 11mm tube size and squared off rear support tube (touring style) - in my case I have a Topeak rack. This object adds to the angle of the tube to bring the total angle to about 20 degrees, which should match the Fly6 mounting size.The SCAD is there if  you want to change size for a different kind of rack.Print the object and use two hose clamps to tightly secure - you don't want it rotating as the Fly6 might go into the spokes.