David, I was the one that brought this mat up (unfortunately), and all I can say is that it was fine for putting my K3 together very successfully and I'll use it again. I'll stop there, but will add that any time I like, after walking across my floor here, I can draw a spark from metal objects. While building my kit, I followed Don's suggestions to the letter, always putting on the wrist strap before beginning and touching the mat before any parts or tools and grounded the "system" through the mains ground in my shack (tied to shack ground too, of course). As always, one should weigh evidence and do what they see as the solution. 73, and I'll go back into my cave, Don, WB5HAK
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