This happened to one of my A6000's too. Do not try any glue, including Super Glue, Gorilla Glue etc etc. These days most plastic parts of electronic devices, including laptops and cameras, are made of plastic called ABS. No glue sticks to ABS; it is just about as bad as polypropylene. The only thing that can glue ABS is the solvent called methylethylketone, or MEK for short. MEK was used as a paint thinner and it used to be available from Lowe's and Home Depot, and paint stores like Sherwin-Williams; however, recently it has been replaced with "MEK Substitute" which is ethyl acetate. I do not know if ethyl acetate will work to glue ABS, but if you get some MEK or decide to use the substitute, drop some liquid on the surface, wait, drop a bit more and press the two surfaces together for 24 hrs. MEK partially dissolves ABS and when it dries the surfaces become welded together.