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on 8/29/11Probably the easiest way is to watch this video
https://www.youtube.com/watch?v=B4u-1tqzG60
I have purchased MANY items on Amazon and consider them to b a Very credible source. If the discount looks too good to be true I would really look at ALL of the details. Some sellers are from other countries and the shipping to return is more than the item and therefore you could feel stuck with it. Just look at the details. As for Amazon, if it is sold from Amazon directly then No problem but, if it is not - I would be careful. Inquire to seller before buying.