We had some heavy duty bolt on forks for a backhoe. What we did was weld some large washers on the inside of the bucket where the clamp bolts touched the bucket. This gave us a fixed width, but that was where we needed to keep them anyway. The bucket had a reinforcement plate in line with the lower pivot points where we alway put the forks. Even if they worked loose the end of the bolt wouldn't jump out of the washer "cup". If they were crooked I would just tilt the bucket down & let gravity straighten them out before I used them.