Remove the 47 mm by 30 mm spring, by pulling it up and off the locking latch.

If the spring is in multiple pieces, does not compress and spring back easily, or otherwise does not behave like a spring, you will need to replace it.

To reassemble your device, follow these instructions in reverse order. The two silver latches will need to be bent outwards separately, and the brass latch will need to be bent back into a "["or "(" shape by holding the pliers to a 90 degree angle of that in the instructions.