Get an old fashioned transformer based soldering gun.  Bend the wire
tip into a loop.  Stick the tool in the loop, turn on the gun, while keeping
the tool centered in the loop slowly withdraw it at least 12" before turning
off the gun.  Done.

The soldering tip/loop is the 1 or 2 turn secondary of a transformer.  The very
heavy current in the loop creates a strong alternating magnetic field.

Genuine Weller at big box store for $27:

http://www.lowes.com/lowes/lkn?action=productDetail&productId=97541-000000273-8200PK

Cheap import for $10:

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=4328

Don









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