1. fix with nail
2. welding (danger!!! caught fire on board!!!)
plans:
- grinding
- corrosion protection (acid?)
- Draining the handle (resin?)
- paracord cover

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format.
You also have the ability to customize your PDF download.
You could gt away with brazing or PROBABLY silver soldering.
Plumbing solder wouldn't work.
If it's still chain like, it becomes a form of kusari-fundo instead of a survival knife.
though attachment would be easier, as you could bolt through the hole that already exsists.
http://www.youtube.com/watch?v=1r0s23HLnQg
chain is solid