FYI I thought this would be of sufficient interest to justify crossposting a link.
Let's just say I bare the scars of the magnifying glass and alligator clip devices.
These magnetic bases are really weak. Stronger ones will let you use a sheet of galvanized steel under the ESD mat which adds a lot of friction if you happen to push on one.
But for ~$20 this such an improvement it's hard to describe. You can also just attach the arms to a flat steel plate with rubber feet and no magnets. Even stiffer and ~$6 cheaper.
Have Fun!
Reg
