Ride Rite air bag install

I am beside myself. I am installing Firestone Ride Rite Airbags 2528 on my 2013 GMC 3500 diesel truck. The driver side joust insert was a very hard to get installed but the passenger side is proving to be an impossible task. Fire stone says use a hammer and a screwdriver well after pounding repeatedly over a 2 day period the driver side finally seated. Not so with the passenger side. I even took a coal chisel and ground it flat and used 1" pipe and had my son pound the pipe while I held the chisel in place......that sucker will not move any more. I do not know how it could come loose as tight as it is. I am thinking of going to Harbor Freight tomorrow and getting an air hammer to see if I can get the insert to turn the last 1/8 of an inch. If I had a lift I could stand under my truck but I don't so I am stuck scrunching under there and trying to work up side down.......