If the finger is not strong enough and isn't working try make the plastic between the finger parts doubled so that the connection between each finger part is stronger
Maybe re-thread string
If hot glue gun has made the finger not move, try and empty it out and then reglue it.
If you can't figure it out, ask someone or watch a video and see the differences between yours and mine. Here
Solutions for Finger not working (Coding)
Make sure your code is right, a way of checking is
Check that the setting is right:
If your getting the problem of the port not showing up. TUTORIAL
Still having problems
Fortunently, I didn't have any other problems with this although you might encounter more, I suggest going to the arduino website and contacting them. If your still having problems please contanct the following number (11101010001100110100001000101) It is in binary hahahahahaha.