MIMF

I'm puzzled by this little bit of geometry. Unlike Les Pauls and other higher-end Gibsons, the Korinas had no headplate veneer- they just painted the front of the headstock black. But that would mean that, with a 'normal' truss-rod slot, the slot would run right from the top of the nut- and this wasn't the case, they used the standard bell-shaped cover with a screw at the bottom center, because the TR pocket starts a quarter-inch or so above the nut..

Was the TR slot a stopped slot, then drilled through into the head? How were they constructed?

Ok, never mind. I got it, from a photo of a somewhat battered Junior. The slot was filled all the way up with the top fillet, and then the access pocket was bored.