I ran into the same problem, and realized what a dumb assembly procedure that was to install that bolt, but I suggest removing the bolt and arm after removing motor mount, leave it up, install the idler, and reinstall the bolt from the top. Avoid the bolt coming loose and extra work involving drilling for a cotter pin . My problem is removing the darn pitman arm bolt with my air impact gun, just came loose a little, but won't come off! soaked with WD-40, but...I don't know. any other suggestions??:axe: