Step 2: Materials
1 speaker with large unshielded woofer
1 metallic bowl
1 exacto knife or utility blade
1 screw driver
rope or string (optional)
Step 3: Remove the speaker cone from the enclosure
Step 4: Remove speaker cone and spider (optional)
Once you have the speaker removed from the enclosure cut and remove both the speaker cone and spider as seen in the above drawing. You don't have to do this, I do because it allows me to hang it from pegboard hooks, as well as giving access to the pole piece.
Step 5: Attach parts bowl to the back of the magnet
Flip the speaker upside down and place the dish on top.
With a large enough magnet even heavy tools stick like glue