I asked Kevin at VAC about which direction the fuse should go in. Here is his reply:
"the current through the fuse is alternating current, is it goes in one direction for 8.33 milliseconds, and then the other direction for 8.33 milliseconds, and so on.
In terms of which end of the fuse connects to the 'hot' leg of the wall current, it is to the right side of the chassis when viewed from the front."
So that would mean looking at the back of the unit putting the fuse into the holder, the arrow should point left-to right. But I suppose one should trust their ears versus this.
"the current through the fuse is alternating current, is it goes in one direction for 8.33 milliseconds, and then the other direction for 8.33 milliseconds, and so on.
In terms of which end of the fuse connects to the 'hot' leg of the wall current, it is to the right side of the chassis when viewed from the front."
So that would mean looking at the back of the unit putting the fuse into the holder, the arrow should point left-to right. But I suppose one should trust their ears versus this.