The vanishing cylinder bug trick.

 From:  DannyT (DANTAS)
2329.3 In reply to 2329.2 
Thanks for looking at that Grendel, but when you rotate the surface to match the seams the orientation of the convex shape is out by 90°, but when you mentioned that I rotated the cylinder 90° and it works also, thanks for pointing that out, but I think it should work either way.........Michael?