Repaired the tongue for a hunting guides ATV/UTV trailer. It had a custom made swivel built into the hitch end, so the trailer and ATV can roll without stressing the hitch. It sees pretty hard use, and was just worn out. Mainly due to him not being able to periodically tighten the 7/8"-9 nylok nut to keep the play at a minimum. So, when I made the new one, I drilled/tapped a 1/4"-20 hole on the sides so set bolts could be screwed in to trap the nut. Then the whole assembly becomes the wrench to tighten the nut. When they're backed out it's free to swivel again. He also wanted a duplicate solid version made to keep on hand for an emergency spare. The camp is a good hours bush flight away( no road access ), so failures are expensive out there. No McMaster-Carr deliveries there!