This item here I got for a dollar at the flea market cause the guy didn't know if it worked......
I'm an amateur luthier wanna-be......I've done a few bridge repairs, fixed broken necks, general maintenance, etc. mostly on my guitars and on inexpensive instruments....(
don't want to "practice" on a 1939 Martin 
)
I'm always looking and thinking of ways to make luthier repair tools out of everyday things instead of buying from expensive places like Stewart MacDonald (
http://www.stewmac.com/)
So, when I saw this heating/solder "iron"? the ole light bulb went on.

The first thing I thought of was a
Fretboard Iron.....When I got home I plugged it in and it started heating up....
It had this 3 position switch that read low, med, high
SPEED
I removed the bottom plate and placed it against one of my guitars for spacing....(
14 frets to the body - 25.4" scale - std. Martin dreadnought)....placed an old blade in my table saw.....then softened the edges as to not scratch the fretboard....
.