If the camera happens to have a problem (like the one shown) where the shutter does not open or close fully, this can be fixed at this point.

Often, simply disassembling and reassembling the shutter assembly will be enough to get it working again. If not, a quick rinse in distilled water can remove any residue or debris which might be jamming it.

The shutter is opened and closed by the tab indicated in the green circle. When the camera is assembled, this tab is pushed as the lens extends and retracts.