Break the key down into primative shapes.
The ring at the top is a torrid. The "thingabobs" are box-like. The shaft is a cylinder.
I'd suggest starting with a cylinder.
Make a couple knife cuts and extrude a box-like shape for the pins.
Make a torrid and connect it to the cylinder.
Subpatch it and bandsaw the edges to sharpen it up.
Give me your email address if you don't quite understand. I'll send you a real quick model so you can check it out.
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