Ok, as promised.
This would be my method of constructing this shape (its certainly not the only way ;))
This is the method, its not an exact recreation but if you follow this technique i am sure you will get your desired results.
Step 1: Create a cylinder, once you are happy, make sure you have edge lines as shown.
Step 2: Remove the left and right faces, then cap the resulting holes in your mesh.
Step 3: Duplicate your shape, reduce its size, and then position it at the correct angle you need to make it symmetrical.
Step 4: Once in position you need to attach them, then delete the opposing inside faces.
Step 5: Once the inside faces have been deleted, you can select the opposing "holes" then bridge them, you can add as many segments as you need to make this smooth.
Step 6: You now have a basic symmetrical shape, delete un needed faces, and mirror until its one complete ring.
THIS SHOWS THE METHOD, NOT THE ACTUAL ITEM AND I HOPE IT HELPS.
final mesh is attached.