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I can't completely tell what's going on there in the picture because of the way the wires are crossing each other. In your schematic it looks like it's a circuit breaker of some sort that has both black wires connecting to one side and both white wires connecting to the other side. In the newer version schematic they show a thermal protector that is in-line with the black wire.
Does your power cord wire attach to one terminal (at the top in your picture) and continue on from that same terminal to the switch or does it connect at the top terminal and come out the bottom near the white wires? You don't want to jumper across that device. It sort of looks like that's what you might have been thinking about doing from your arrows but I can't really tell and it might just be coincidence.
It would probably be most effective to disconnect the power cord hot lead from the first terminal at the top and place your fuse between that end of the wire and that terminal (basically between your green arrow and the terminal). This way the fuse is the first thing that the current flow sees as it enters the amp and it would blow before the current reached anything else, including that circuit breaker/thermal resistor thing if your amp has it. I believe that those reset themselves whereas the fuse would just pop if something was wrong.
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