>The tooling (carbide bits) that these things use doesn't
>last that long, and standard pricing is quite high (~$17
>milling bits.  Each.)  There aren't a lot of second sources,
>either (unlike drill bits.)  Grr.

How are the tip of the bits shaped? If they are flat like a normal milling
bit then this may be difficult, but if they are V shaped like a countersink
bit I would be tempted to try a normal carbide tipped drill as a bit if a
fine enough one was available. It may be necessary to grind the tip to a
sharp point, but you may get away with it for a quick development board
without doing this or using an expensive tip.

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