Thank you. I cannot provide the manufacturing information for privacy (theirs) reasons. Any rollator you find on search string is pretty much what I have. This is steel frame and main problem is with use (and not much of that) the nut bolt come apart. There are six. Two holding the wheels in place and four on the A frame. The technician said once to me if THIS screw comes loose, it will collapse. I think I can send an image of that and the other without violating privacy issues. If you want that. For an ordinary application, I would rely on a split, or antilock (American thread), but wanted to be sure since the company will pay to have a mechanic weld the screws in permanently. I wanted to hear what a mechanic in the area had to offer, but cant speak to one I cannot find.
You are one of the better experts! Thank you. I will get the loctite AND the (probably Belville) washers.
As to Vandenberg, thank you, XXXXX XXXXX dont think they repair this equipment. I live in NYC, 10011, If you happen upon the title I would look up for someone to weld something (not solder. I have that), please let me know. Thank you again.