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The power slider on my year old KK (nee K3) has a very very slight amount of front/back play. There is no left/right play though the spring pressure is very minimal when its at the resting position.
There have been reports of these sliders binding and not springing back after use forcing you to push it back manually. Usually this clears up after some use and is generally attributed to dirt or something sticky getting in the edges around the slider (caused by ?? operating it with slightly dirty fingers, ...). Mine did this some months back and cleared up on its own after about 10-20 operations. Perhaps Amazon has recently revised the part to have more clearance to reduce the problem.
The slider is not the real switch itself; it just operates on the real internal switch. The slider being loose does not indicate that the real switch isn't firmly mounted on the circuit board inside.
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