What tank do you have? Yes, you'll have to get into the turret to bend the bracket. If it's a tammy tiger just hold the mantlet/trunion area and slightly bend the recoil unit/bracket slightly up or down. You could possibly do this from the underside of the turret as well. Take the turret off the tank and go at it from the inside, the bracket that holds the elevation unit may be in the way though. To tighten the nut you can use the "T" wrench supplied and tighten from the top on the brass hex screw.