Good that you included the photo...
The 2 pieces look like the hook and the retainer ring that hold the bobbin.
The piece to the left is the hook ... one to right the retainer ring. The bobbin fits into the hook.
There is a diagram below that should help.
The two black 3/4" long levers need to be twisted outward...then put the hook in ... followed by the retainer ring .... and then twist the two levers back.
Generally the two parts will only fit in a certian way to be able to successfully twist the levers back ... could be some trail and error
I tried posting another diagram but fixya would not upload it ... I will post this answer and then try to add the second diagram
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