Well, I hear the spiral bush is a good solution when the cheek is cracked through the peg hole. Clearly more significant on an instrument with a true peg that has to press in, sure, since it will perpetually open the crack - but also seems like a sound idea to me when we'd be talking about placing it inside of a plain bush anyway and the top half of the pegbox is broken off at the holes... Makes sense to me to put the pegbox as solid as possible with new wood, and then reinforce the spot where it broke (the holes) even more; clearly the original wood in that spot is less than ideal or the neck would have broken first and spared the pegbox, yes?
(Pure speculation of course - I'm not qualified!
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