It is available on the US Amazon site but not the UK Amazon site. That makes me think that it might not be legal in the UK (for safety reasons), I am only guessing though.
Most of the positive reviews seem to be Vine reviews.
In the US it is $99, over here it would probably be about £105 (inc VAT).
I didn't mean that the blade would deform backwards. I was suggesting that without the guide wheel, there would be pressure to push the blade backwards. That will then put pressure on the fixing mechanism and, additionally, increase the likelihood of the blade deviating/bending to the left or right.
Again, I don't think it would legal in the UK or EU. That said, I am only guessing.
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