I hot glued a 6mm spring at the back of the handle to avoid too much bending of the wire. 

I also etched a copper plate for the look (Regad sells those similar block of wood with 5 holes for 50$ which is insane)

The copper plate etching was something I wanted to try anyways. To do so, I simply spray painted the plate then engraved it using a desktop laser.

I had to gently clean the lines with a Q-tip and alcohol and then placed it into some ferric chloric.

I cleaned up everything with acetone, highlighted the etched part with a marker and sanded smooth the surface with a high grit sandpaper.