I need an epoxy that is strong to the point of brittle. I want no flex; it
has to transmit vibration as close to 100% as possible.

Sounds to me as if you're actually looking for stiffness, not
necessarily strength?

I think you'd want to look for (or make) a filled epoxy. A
high-strength epoxy which is loaded up with (e.g.) chopped or milled
fiberglass would be very stiff.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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