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Good to know, thanks. I guess I just wasn't careful enough. It's amazing how little damage there would appear to be on the key and how much of a difference that makes to the fit.
@dancing james Yeah the rest of mine have been the same, always felt really solid when engaged. It's just these stem bolts using the smaller key I've had a problem with.
beach
I managed the same thing with a micro torque key when tightening my seatpost bolt. I'm convinced I had it in straight and didn't over torque but something obviously happened to make it slip and the key was damaged to the point it was unusable.
Now I've a replacement key and I've since been super careful and insanely precise with every single crank of the bolt. So far so good but it's not often I make any adjustments.
Thank goodness it's the key that fails and not the bolt.