This is one that was in my box of parts, as you can see the shaft is broken off of the lever, but I could weld that back on no big deal, thing is is it looks slightly different than what you have.
Two of the motors I have out back also have the same deal, it's a smaller shaft about 1/4" as shown in the picture that slides through the middle of the larger sleeve thats about 3/8". The end of the quarter inch shaft has a flat tire that another piece connecting with a setscrew. I think the piece that attaches to that shaft locks the motor down when it's in the run position, so it doesn't flip up when you go in reverse.
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