Okay, after all this talk about signal mirrors and aiming the flash, I decided to try mine(el Cheapo) out using the brightest light in the house -- the bathroom -- and unless I could actually SEE the reflection against the far wall, I had no clue as to which way it was shining, or whether I even "captured" the sun at all...trashed the mirror with no hole and I am gonna look the for the one with a peek-a-boo hole!
b