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A few years ago, I gave a TomTom XXL each to my g/f & to my mother. Both GPSs have begun to fall while driving due to the knob NOT locking in the lock position, so I took one apart to find out why. The outer arms where I added foam pads are supposed to engage pegs on the back of the knob, but the catch clips that hold the knob onto the base constanly compress them so they don't touch the pegs. I used a drill press to add 2 common BBs so the knob REALLY locks now.
