Recently I want to change the string of my guitar. This is the first time I change a guitar with floyd rose tremolo. After I loose the screw in the saddle, I found that the original set up is weird. Now I am not sure which is the correct way to insert those block inserts. That is to say, I don't know whether the hole should point to the neck, or point the rear. And I don't know whether the hole should be at top, or at bottom. Please help!