How to fix handlebars that have virtually turned into a seesaw I have a Roadmaster Granite Peak Women's Bike. It was really cheap, but I'm not sure if this issue has to do with the quality of the bike or how it was put together. The issue is the handlebar has loosened and is like a seesaw because it slid out of the piece that holds it in place, the part in the red circle. However, they are not loose enough to just slide right back into place. How would I fix this? Thanks in advance]1
Cut a piece from an aluminum can and insert it.  Aluminum is soft and it will (hopefully) clamp in.