first of all I have to admit that this is my first contour knife so maybe my expectations of such a tool are unfair. But speaking from a place of relative ignorance, I wasn't thrilled with this particular tool. It more or less does what it says on the tin, but the sliding of the plastic pins isn't particularly smooth, even when the shutter mechanism is fully open and the tension is low. (By the way, the turnbuckles can be adjusted with an Allen wrench [included], which is so small I'm sure I'll lose it before I'm done with this review.) For handling smooth turns or right angles, this sensor works respectable. But I've found that the plastic pins flare up a bit at steep angles (round or triangular), which can be an issue depending on how precise you need to be. This is probably fine for a decorative molding on a sideboard or cabinet, but I would find even a slight inaccuracy tiring if using this to lay tiles, for example.
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