Superglue or crazy glue as it is sometimes called will make an extra strong bond if mixed with baking soda (Bicarbonate of soda)

So if you have a hole or indentation in almost any material that needs filling have a go at the following.

Place a few drops of super/crazy glue (Fluid not Gel) in the hole/indentation and while wet, add Bicarbonate of Soda. Then add a few more drops of super/crazy glue. This will set and become extremely hard. You can file, drill etc.

Be careful a chemical reaction takes place immediately and creates a lot of heat in a very short time