robc02 wrote:Sounds like you are heading down the path of making some sort of adaptor in your shed. Some contraption that would allow you to effectively widen the top of the rack. Possibly involving dowel, wire ties, etc? You'd need to widen it by about 20mm to be in the right area.
This how I did it (to fit my Arkel Tailrider to a Tubus Vega):
Thanks for taking the time to post all those pictures
I think your practical skills far exceed mine, but what type of wood have you used? Is it heavy? Is it weather proof?