A crazy thing happened this morning during my morning ride. My left crank arm came off, during mid-stroke. I didn't crash or anything. It just took me by surprise.
How do I fix this since it looks like there is a silver washer/spacer that is needed (see pics from my wife's Halfbike). The threads don't look stripped, so I'm at a loss at what causes this (and how to prevent it in the future.)
Any suggestions from the people who've been riding for a while?