[QUOTE=Homeyba;16216566]This may be a silly question but, why would anyone bother with something that wasn't manufactured correctly ..."
Homeyba has a good point. However, the crown race seat on the steerer can be faced (metal removed) to accept an ISO crown race (smaller inner diameter) using a standard Park tool. The head tube ends can be reamed (enlarged) to accept the larger diameter ISO cups again using a standard Park tool. The cost is minimal, less than $75 at a knowledgeable bike shop, so modifying the existing frame is reasonable.