Make yourselves all a favor, if you own a dremel with a cut-off wheel.
Here's my clickable thumbnail tutorial
I went and bought a sheet metal nibbler for $17AUD at Dick Smiths, that's Australia's version of Radio Shack. I'm sure you'll all find one locally for peanuts.
That speaks for itself, I clamped the nibbler and used the cut-off wheel on it. That was a 30 second mod, I'm serious! The cut-off wheel cut through this metal like butter.
You can see the groove I made here
Cutting some fret material
The end result, sorry about the bad quality picture.