I dunno... I just have a typical Radio Shack gun-style soldering gun and
it's worked perfectly every time. No need for a coil at all...

Bill

Sure, you can cobble anything together. In fact, why cobble anything
together,
just use an electric drill or soldering gun.

Personally I prefer to drop a $20 on a commercial product that was intended
for
this purpose. Just giving the OP additional options other than a (what I
consider) an ill-suited item such as a bulk media eraser.