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I believe it tends to happen when the original topic has been pretty well explored and answers start to get repeated. Then again hearing of Oz's super it's all in the hips stripping flying round...

Maybe a bit of both from oz. Add a little excitment and danger. You could really show us yr hmmm technique

I'd compare it to finishing honing. Just enough to make contact and stay in place as you move it along. So sweet stuff all. hope that helps