Epoxy , epoxy, epoxy forget superglue it's just not meant for this application. Superglue is brittle when cured and this area will be subject to a tiny bit of bending and a lot of shear.
Get some good epoxy and heat it gently it will flow just like thin superglue, also a little gentle flexing , letting gravity help will get plenty of glue in there no problem.
If glued well why would it NOT hold? Think about what forces are acting on it.