Small bottle of superglue thin viscosity 6.5grams with stopper cap. Fast setting glue but you can increase the speed of set to instant with a cyanoacrlate activator spray.

I find superglue useful to fill gaps and small holes, small drop in hole or gap then quick spray with activator and file or sand down as required

Useful note - To increase the life of your superglue store in fridge or freezer with the cap on.