I read it was more reliable to scratch the board from enamel around the plug and re-solder it widely to allow better reinforcement than adding glue as glue is too soft and elastic.
I'll give a try these days on an old n900 bard.

Done and working!
I explained how I did here

And by the way, don't throw your n900 with broken USB, fix them or send them to me, I got addicted to save them