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For future reference and for anyone else using the Dovo sets!!!!!
Use either an old scale, or any piece of wood, or plastic, with a 1/16 inch hole drilled through it, to press the Dovo lock washer...

I am not seeing where you peened the pin at all in your post,,,
The Dovo pin system is rather easy to use the locking washer that they supply works very nice but you still have to peen the pin in...