We've used an Udo rigger that was made for an ASW-20 on our DG-505 Orion quite successfully simply by making the trailing edge clamp longer to deal with the greater chord. I've got one for my 15b and like it better than the others I've seen. I actually prefer the mechanical jack to the gas spring setup on some riggers. I think what really makes the Udos work well though is how good a job he did making the wing saddle - very substantial and fits nice and snug to the contour of the wing.