You will need: A flat head screwdriver
1. If one of your handles is stuck it will most likely look like this
2. Locate the push button that is stuck inside the tube and use a flat head screwdriver to lever the bronze push button up, just enough so you can move the handle.
3. Twist and pull the handlebar out of the socket
4. When reinserting the handle into the bar, make sure to line the brass buttons up with the holes to avoid the handle getting stuck again