There are many tutorials on youtube on how to do the magnet mod on an iPV2. However, the rear cover on the 2x is apparently a bit thicker. I just completed the mod using 4, 1/8 X 1/8 cylinder magnets instead of the 1/16 X 1/8 magnets. Adds about 1/4 again the amount of holding force. Just though I would share.
Magnets used...K&J Magnetics 1/8 X 1/8 Cylinders, D22-N52, NI
Magnets used...K&J Magnetics 1/8 X 1/8 Cylinders, D22-N52, NI