Unhooked the slider under cover in order to service the roof, lube, adjust, etc, which I have done many times to many Volvos. After the servicing which went without any glitches, the slider WILL NOT hook back up onto the wire gizmos on each side-it seems the metal tabs are suddenly too short so the springy thing is not catching. I have retraced and redone the whole process, oh, ten times, and for the life of me I cannot figure out the problem. The springs are fine and attached correctly to the roof; the tabs are welded securely to the cover; the cover seems to slide forward and latch as it is supposed to the front part... Anyone has experienced this before? I hate mysteries, with my Volvos anyway, and am greatly disturbed by this...