Well, I did just buy an angle grinder for this very purpose. Unfortunately it didn't come with a couple of the parts that are needed to be able to use it. Once the replacement parts come I'd be happy to help you out with it. I've got a half barrel keg I'm planning on doing the same with.
On Tap: Bigfoot's Barleywine Ale, Boulevard Tank 7, California Steam
Waiting: Hard Cider, Pumpkin Ale, Black Hills Porter
Ready to brew: Autumn Amber Ale, Smooth Nut Brown Ale, Black Hills Porter
Primaries: Peppercorn Rye
Bottled: Beaujolais, Cabernet