Step 1: Materials and Tools
a means for filing metal. I'm using a tile wet saw. That may constitute tool abuse, but most metals were once mixed in with stone, so I don't see a problem here.
Elastic hair band
Step 2: Cut and File
Cut away excess length to the standoff with a saw. Keep your fingers well away from the saw blade.
File halfway through the standoff to make notches.
Smooth down any rough edges with a file.
Wash your hands and everything afterwards to remove any little bits of metal dust.
Step 3: Attach an Elastic
Step 4: Finis
Step 5: Afternote: the Failed Approach
This was very difficult and frustrating and didn't work well.
The elastic through the notches works well enough and is much much easier.