Alright, we've stopped for tonight, the damn thing is killing us. We've tried putting the two front bolts into the tunnel in first followed by the two rear bolts and then tried pushing the center mount up, but it's just too damn stiff to get up towards the holes for the bolts. When we try pushing the center mount up, we also use a prybar to swing the small bar on the center mount up towards the holes, but nothing helps! This is getting extremely frustating, we've been working on this problem for two days now. Once with 4 people at once, trying to push that damn center mount back up in the tunnel, it just doesn't want to cooperate. As I wrote, it's like the tunnel is too narrow. We've tried pulling the tunnel walls away from each other as hard as we could while trying to push the center mount up, but still it pops back down or just doesn't get close enough to the holes.