(I don’t expect that everyone globally will recognize the humor, but this is intended as a humorous post)
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Some reviewers köh Chris Haye… pronounced it like taco so not so far fetched 
There is actually a solid background on why a grindstone is a good translation.
When you grind good laptimes on the track. There is actually a Finnish saying/idiom also, used by the F1 and other motorsport commentators, to “Tahkota kierroksia” (grind laps) or to “Tahkota kierrosaikoja” (grind laptimes).
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Thanks!!!
Grinder would be the best translation
I thought it’s mostly due to the odd sharp edged shape.