[ATTACH=CONFIG]503501[/ATTACH]
The position finger is not in! In this pic the slot is not in the opposite position to where you want it.
Slot in question is marked 1. Rotate it clockwise until it's in position 2.
Loosen screw 3, and push it in the direction marked until the end of it is actually holding this in position.
Very important that, as CD mentioned, it is not tight. The thread must pass through the gap.