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Thanks Chris.

Well, I made a cylinder at the right depht, used knife project to cut out the center leaving an open circle.

Then I deleted everything except a quarter of that circle. I filled the open space with faces. Made a copy of that circle to use in the other bends (I still don't know how to make those the right way.)

With that part I started to compose.

Extruding the ends, using a copy of the bends and so on...

It took me some time to get it too...