I noticed the other day that my knob has a dark 1/2" hairline fracture running from about the centerline of the knob over the outside edge of knob. It has just started to get very cold where I live and wonder if this has caused the plastic to shrink around the shaft. I don't leave the Mk2 in my vehicle overnite but I do leave it in during the day at work, there's no danger of theft there.

#090000695 Mk2 BLUE 12Gig