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+1 to what Glen said. In the SRP classifieds here there is a magnetic blade jig/holder that Rayman is selling. The aluminum acts as a heat sink when using the dremel and the magnets hold the blade...

Any dubl duck special no. 1 I've seen is a full hollow. Too bad about the broken blade. On those full hollows I would stay away from heavily rusted specimens. They are already mighty thin.