[ford38v8]

I believe that your ‘34 adjuster is similar to my ‘38 adjuster, which does not screw out from the rear of the backing plate, but rather, to the front, which in doing so, pushes out the dust cap. As yours has broken, you’ll have to remove the dust cap with a pick of some sort, to access the adjuster and wedge within. As for replacement parts, and other help, you’ll find none better than Flathead Ted on this forum, and his floater wedges, which are superior to the original Ford wedges.