I drill a hole with diameter of the tang thickness but if there is more than two diameters wide I drill a pair of holes and have a piece of commercial hacksaw blade set into a handle as a broaching tool to clean out the web between the holes or conversly open up the single hole to make a snug fitting for the tang, As
@freefall says notch the tang to give the epoxy a gripping area and it should all make a nice tight hold on the tang.
Make sure to temper the pice of commercial hacksaw blade (@450*f as it will break quite easily if the apprentice is a bit rough with the broaching
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