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Perhaps my arkie isn't as hard as your new ones. I did do a specific gravity calculation on the rock and it worked out at 2.53, so it might be on the cusp of been 1 or the other in terms of hardness....

Today I had a brainwave. I have them often most of the time there fruitless and get me nowhere.

So today I decided to take my Arkie and lap it, I've done this before, It didn't need to be done. I...