p.s. be sure to order a tube or two of Polywatch if you haven't already done so. All I can say is it's magic, and makes scratching up the crystal from time to time seem like not a big deal.
In the photo below you see the result of me scraping the brick wall adjacent to our booth, in a bar, after imbibing much drink with Mrs.Jones. Less than 30 seconds of work with two drops of Polywatch and it was like it never happened (the scratch, that is -- my headache the next day affirmed that it really happened).
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