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I've modified my TrackClip Pro a little bit by adding some black matte tape to the longer of the arms that hold one of the IR diodes. the reason is that I was getting jerky movement and imprecision when looking up in certain directions when the shiny black plastic would reflect the light from the middle diode and create a false signal.

So I suggest a IR-non-reflective finish be adopted instead for future versions to avoid this problem.

I will pass on the info.......