The stands were assembled when i got them, so I tried to just bolt them down. They would not drop over the pins in the head. I loosened the bolt that hold the shafts to the stands which allowed the odd stand to drop onto the head. I am going to pull the one bank off and send it out to see what the problem is. The other bank fits great, just need to get my rockers a little closer to the correct ratio. It was amazing how much that shaft sprung when I unbolted it. Tim