OK, I know this is a dumb question, but I need help. I can't figure out how to put my crossbars ON!? I just bought a '98 and the guy has factory Toyota Ski racks on his crossbars, which is great! BUT he had the whole assemblies completely off when I bought it. SO how do I put them back on, without snapping the little plastic tabs off of them? It doesn't look like the ends are supposed to come off the rails, so how do I slip them on?! He did give me the knobs to tighten them down with, but I need to get them in the rails first! HELP, I leave for Tahoe tomorrow! Any tips GREATLY appreciated!!