Quote:
Originally Posted by erick
Two problems I can think of:-
1. Back of mirror is not perfectly parallel to the front surface? I guess could place a spirit level across the front of the mirror (just touching the edges) and adjust until level in several directions.
2. Damn surface tension means the water droplet "sticks" and fights gravity - hence the add detergent suggestion and tapping - not sure how hard you'd have to tap a 22" lump of glass to transmit a "shock" to the droplet - maybe a big sledgehammer!
OK, maybe not such a good idea after all 
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No no you use your collimating mallet , rubber of course