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This video might help. Also this website will give you some more insight.
http://www.passion4mopars.com/Mopar-Small-Wiper-Motor-Components_c_9.html
I think you are referring to the crank arms. They should be slotted and not spin at all.
You will never be able to install them in the car. Take them out and press the bushings in the vice with the correct size socket. Put a bit of silicone grease on them to make it easier. They make a very definite snap when they connect properly.