Originally Posted by Doug Fattic

Yes, its called a jeweler's saw. They are available from such places online as ottofrei, gesswein and contenti. Blades vary in thickness and number of teeth. They are easy to break if you tilt the saw slightly during your stroke. It is possible to break dozens on a lug until you get the hang of it.

I don't saw right on my cut line but rather close to it and then finish with a regular or needle file. Often it is not possible to keep the blade at a 90º angle to the surface anyway (because other parts of the lug are in the way) so this off-the-line cut is necessary.