[SML] hot wire foam carving transformer

[Nigel Worsley]

> I am having trouble finding the model she is looking
> for.  It is Variac transformer Model No: SC-20M

You aren't looking very hard!
http://www.allelectronics.com/make-a-store/item/sc-20m/20-amp-variable-transformer/1.html

Looks identical to the Amazon one.

One thing to note is that variacs do not provide any isolation, so if the hot and neutral inputs are reversed the output will be at 
full line voltage even when turned down to zero volts. And even if it is wired correctly, if either output touches anything grounded 
then the upstream GFCI (you ARE going to use one of these, right?) will trip.

Nigel Worsley