One of the connections (for lack of better term) on the handrail along the stairs to the second floor came loose - it's actually fully detached from the upper part.
Here is a look at the full assembly of the specific handrail block:
Looking in between the "components" I do not see any bolts or nails - looks like it was previously just glued together (you can see bits of glue in the last picture), which clearly didn't hold well.
What's the best way to fix this without radical surgery? Should I use PL Premium adhesive to attach them back together?