Those 3 bolts are either a 3/8" or 7/16" and require a deep socket with 3/8 drive. If you can get a 1/4" drive with a socket in there it will fit easier however I have been unable to turn the bolt because I could not get enough leverage. Even with that you will need and extension to turn the socket.
Highly recommend using some lubrication. A vinyl, rubber treatment or something like that would be good to place around the hole to those bolts.
Action
Highly recommend using some lubrication. A vinyl, rubber treatment or something like that would be good to place around the hole to those bolts.
Action