There's not much to look at. That little plate in my photo is bolted to the hole at the end of the drawbar and to the first larger hole. I have an early HF QH that needs Cat 1 to Cat 2 bushings on the implement to fit the hooks in the QH. So I mounted the drawbar using those bushings, bolted the plates, and tack-welded the visible part of the bushing to the plate. Then I carried the bushing/plate assemblies into the shop and welded beads down the front and back of the bushing/plate joint. These weld beads bearing against the front and back of the QH's hooks bear the twisting stress and stiffen the plates.
The sleeves aren't welded to the drawbar so my adapters can be unbolted and removed, but I never have.
I think later QH's come with larger OD bushings for your implements so use a pair of those to make these anti-twist gadgets.
I'm back in town now after a week out at the ranch (orchard) or I would take a better photo. That's the only photo I have that shows my anti-twist adapters. I've used these since 2009 and they haven't bent.