I gotta see a pic. I think I am following the extension part to pic up the spring hole. I don't get how you make the Ubolts work. But I don't have to know that, you guys have helped him. I am a hanger-on without a cause. Just curious and love to solve mechanical issues. 10mm is 3/8 thick plate. I will study the AD rear ends as I get a chance on the interweb.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn