I stand corrected, its is an Italian thread nevertheless the thread is now defunct and definitely not a keeper. I have attempted to drill however, nothing says 'this wont work' quite like a drill from argos.
I'm looking for more brutal means... Vaz sounds interesting? Where could I locate some? Would blow torching result in permanent damage to the frame?
Vaz is not a product!
http://www.cycle-finishes.com/