Add glue to the problem. It usually works. Maybe glue alone isn't enough. Try glue with resin. Or paint. Or fibres. Or filler. Or glue and a screw. Or glue, and then filing down the glue so it's nice and smooth. Or glue, used to glue a whole lot of leaves over the offending object, thus turning it into a new, gluey, leafy object. Coat the leaves in glue for added durability. Glue, man. Glue.