So, my truck came to me in boxes. SLOWLY getting it back together. Having a heck of a time with the door windows. The won't stay engaged with the regulator. New everything including glass and metal piece that attached to the bottom of the glass, that was replaced as it was rusted through. The "balls" on the bottom of the regulator do not appear worn. Am I missing some piece or something? Have the shop manual and cna't find anything about adjusting. BTW, they are falling out when the window is fully lowered. Getting tired of taking off the door panel. Any help is appreciated. Thx