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Q. Well, I've just recieved my book. After a couple of days in the sand box, my knees are ate up. Do you have any tips for that? Love the book, after years of failed attempts.... Success. YEAH.
You must be working in some really grainy sand!
Amazin' Walter straps on a pair of knee pads before getting started.... or you could try one of those plastic-coated cushions they sell to gardeners.