Our 150 gallon sprayer boom hinge broke and a replacement is no longer made so I had to repair it. The threaded end of the shaft broke off. The shaft must have had the bottom part cast around it. I tried to remove the shaft, but could not get it out, so I decided to drill out the shaft. First I cut the damaged part of the shaft off flush with base. Next I drilled out the old shaft. Then I tapped the base to 3/4 NF thread. The shaft on the boom hinge was 5/8 diameter and the broken-off thread is 5/8 NC . The plan was to make a shaft with a 3/4 NF thread on the bottom and 5/8 shaft and thread on the top. Then I would use some red loctite and thread the newly made shaft into the base, and assemble the hinge. We used the repaired hinge the last time we sprayed and it worked well.
