Make a high quality clamp or spring vice from a few inexpensive components.
- 1.25" Binder Clip
- 6-32 nylon standoffs
- 6-32 screws and nuts
- .5 or .75" rare earth magnet with cup.
Drill a 9/32" hole in the side and bottom of the binder clip (the clip steel is very hard).
Add 6-32 screws and nuts to the binder clip.
Screw the clip assembly to the standoff and magnet.
You can mount the clip either horizontal or vertical.