broken exhaust studs

[fazersharp]

I removed the rad and dremelled the rusted nuts off (2 cuts on each in a wedge shape then a cold chisel to tap and turn).  Didn't even try soaking or turning them as the middle 4 were rusted solid.  Replaced with brass domed nuts with some copper slip, ready for when I could get some Motads. 

I think that is the way to go after all we are not going to re use the old nuts are we.
I have ordered a tin of kroil have a google about it as it seems the best stuff but not readily available in this country and what I have brought will last me forever. My plan was although my pipes are good for now by the time i come to remove them I will have had months of applying a penetrating oil, my bike is 16 years old and has the OEM pipes although apart from its first 2 years of life has never been ridden in the wet.

If I was to use a dremel what fitting would i need and is there different types of dremel. I may just buy one on ebay for the job and sell it straight on