Recently, the tie rod ends at each tire, were at their loosest settings. The slot across the top of the tie rod end would not hold any tool I have, except for a flat stamped steel wrench (spanner) from either a die grinder or an angle grinder. The fingers of these wrenches fit perfectly into the ends of the slot atop the tie rod end. Had to turn it clockwise from above with an adjustable wrench. Each 1/2 turn I pulled up on the tie rod end to check for slop. After around 2-3 turns, there was no slop left. The steering was greatly improved.
Mike