A couple of us Iver collectors did a little how to a couple months back. Personally, I like the "tie rod" separator. If you can heat the arm with a propane torch first, it'll make the removal easier. If you haven't tried already,, the little slotted nut is left hand thread. Homemade tools. In 20 years collecting Iver, I've never seen factory type tools that may have actually been used. The last pic is an original wrench for slotted nut and b.b. locknut.