Hi Yves,

Another method would be to created the two red surfaces (Extrude) and the green surface on the diameter, I used revolve at 40°, this would be where the clamp sits, then use blend (Curvature G2) between the end of the red surface and the end of the green surface this way you can dynamically adjust the bulge, I used 2.25, join all and apply a thickness.



Cheers
~Danny~