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Oh, and go to the local postal depot with your stone, and ask them nicely to put it on the scale to weigh it. They will (normally) be more than happy to, as they are asked often for such services so...

Didnt you HAVE a large Ark, and sold it? Or am I doing more of that 80s style crack?

I myself will not burnish using a buffing wheel. Far too much chance of ruining the perfect flat I worked so hard to achieve!
I wish I had a huge-ass stone like that. Maybe one day...
That...