Move-Shoot-Move Wedge for precise polar alignment

Update: Avoid it, it has serious quality issues! Some of the flaws coming from the design, which will make the polar alignment way harder than it should be. The free movement of the vertical screw effecting the polar alignment, and a little touch is enough for it to mess up the alignment. Also it is just the matter of time when one of the nob will fell off. (I have 2 of these, it happened to both, for the second one it happened while using it for the 3rd time.) Also the vertical screw is really week on my second one, after setting it and releasing it still moves, just enough to mess up your alignment, even after tightening it as much as possible, with a light load (Z6+ftz+50mm1.8G) Really not woth the money.