If you really want to fix it, I would suggest using tree resin instead of glue as the properties of glue would make the wand exteremely unconductive. Don't go harming trees to get resin; find one that is already producing some.
However, I would agree with the above two that the best solution would be to make or buy a new wand.
i suggest if u bought that wand u wanna fix. u should forget about it and not buy a new wand. but make ur own. its much cheeper and much better then a store wand. becuase that means its ur energies surrounding the wand and ur more connected making it easier for u to use it.