I discovered that the front arbor bracket casting has a small area broken off the little bump out ledge (see red arrow) where the 90 deg. stop screw (labelled C & D) should hit it. :^(
Not a major issue as I rarely tilt the blade, but I think cranking the mechanism untill the stop screw hits the ledge helps take out the backlash and better locks the mechanism in place. Hmmmmmmm… I’ll have to think on this one.
-- Pine is fine, but Oak's no joke!