Tony: There is a copy of Jesse Lindeman's patent for his 90 degree roll-over plow listed now on the BO Lindeman Archives site, which is hosted by Ted Adams, so at least you can read how it is supposed to work.
We have two of these plows here at the North Spokane Farm Museum (200 miles east of Yakima, the home of Lindeman), both missing the crucial 3rd link parts. We have aquired a 3rd plow (in Colorado) which has these parts, but have yet to get it home. Once we do, I plan to reverse engineer all the parts, then fabricate a couple sets for us. Once I have the drawings done, I would be happy to share them with you so you can reproduce parts for yourself. Let me know in about 6 months.