Third Hand Cable Holder

NOTE: This is a prototype that is not fully functional yet. Any notes or pointers would be appreciated, especially on a better way to grip the cable. DO NOT EXPECT IT TO WORK!

Used to hold a cable while tightening or changing brake and shifter cables.

Hardware:
6 m3x20 screws
6-9 m3 nuts - 2.5mm height
7 washers - 7mm diameter
6 m3 lock ring washers
1 spring - from ballpoint pen