washers

These were in the bag where I was keeping my speedo drive. Are these a part of the assembly of the drive or front wheel? Or did I just mix them up? Where do they go?!? You can read my full build thread HERE.

When I took apart my wheels there were these little washers. I didn't get new ones so I assume I should re-use these. Correct? They have been de-greased and soaked in the de-ruster but still look a little rough. Should I give them a ride in my tumbler to make them smooth? BTW, the thread on...