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I assume you mean a separating disk like this one:

http://kn-dental-ceramics.com/Disk.jpg

I would further suggest this being the max diameter. The smaller the disk, the less risk to damage the...

Leon, you may want to check out this site:
http://razortips.blogspot.com/
Lots of useful information from Bill Ellis. I also highly recommend his CD.

I got 1/16" brass rod and matching tubing at ACE hardware (Just for the folks in the US). I'm sure they have hardware stores in Portugal as well. :D

Leon,
I believe your first real problem will be to remove the metal scales. I don't see this happening with the tools you have. Could you maybe borrow a dremel like rotating tool from someone? After...