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Maybe this will help.

A circle with a radius of the ring.
Extrude with Push/Pull to the required thickness.
Use Offset first to delineate the radius of the post. Then draw a line for the flat.
Push/Pull to get rid of the waste.
Select the remainder of the offset edge and use Move/Copy to copy it to the opposite side. You could have used Offset on the other side as before but this is quick and easy, too.
Push/Pull the inner faces on both sides to make the post.
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