Take proper tool and fix it.
...
..
.

Well, this instruction was detailed enough, considering amount of info You've presented us. what isn't working? It doesn't move at all? It moves but nothing happen? do you feel spring's resistance? Do you tried to disassemble device, and check how it looks?

It's probably 100% repairable without *much* effort, but, still *some* effort is required. It won't be repaired by touch of magical rod.

/Estel