Screeching noise, thats funny. sounds like you put your thinking cap on for that idea!
I do have a shrinking disc and it works wonders, but the problem is, its like a 6" wide recessed section, so its tough to optimize a 9" disc on it.
I used an old 3" flap disc that was worn and not really cutting on an angle die grinder and this heated the metal real quick for shrinking, I also tried a small butane micro torch, they both worked but I still have the buckle/oil can effect.
Should I keep trying to shrink it?
Anybody else have an idea?