I own an A10 and some times when I turn it on, nothing happens. If I wiggle it or press the tailcap in a bit it will go on. This is very annoying and I figure the best thing to do is disassemble the light and clean it. This is my first serious light and I have no idea how to take it apart. I searched and have been unable to find a thread with step by step instructions on how to disassemble, clean and reassemble lights. Help please! Thanks.