Backpack repair (zipper detached on one side)

Hi there.

I've been trying to find a place in Tokyo the entire day yesterday to repair the zipper on my backpack. But without any luck.

In this a city where anything is possible, it's probably just me looking the wrong places.

I'm here untill the end of next week.

So far I've tried Mister minit. (Estimated repair time, 7 weeks)

Shoe repair shops (So far everyone said no)

And I've tried to put this in Google maps お直し (tried 3 places, all said no)

I would be really grateful if someone could guide me in the right direction!