Last year, I decided to upgrade Baby Blue's seat belts to retractable units, mainly because of the way my daughter moves about in the car while we're driving. I ordered a pair of retractable units from VB. Installation was a breeze, as I just mounted it directly to the rear wheel arch. However, the biggest problem I'm running into is that the one on the driver's side jams / inertia locks without any rhyme or reason. I can usually get it going again with some finagling and effort. I have it set up identical to the passenger side in terms of where all the arrows point, etc. Is this unit just a lemon, or am I missing something in the setup?