Carpetsahib, beautiful mannlicher!!!. I have a greek one sitting in the safe and has the usual rusted, corroded and beyond hope bore. No amount of cleaning, chemicals, abrasives or other means short of destruction have had no effects. That was bought many years ago in the hopes that it could be resurrected into some former shadow of itself. Sadly the years have gone by and there she still sits.
I have to agree with you regarding the dremel stones. I normally use it for sharpening my mower blades. But occasionally it comes in handy for firearm related chores. Actually regarding removal of the charger bridge it would be way better to use a mill. With radius cutters would eliminate a lot of hand work and give a more finished appearance. Sort of like when one removes the ears off a P14 enfield and recontours the receiver. But still a lot of work. Did one once. All by hand. Frank