The holes should NOT be drilled out to accept a blade. These were built by taking a needle file and cutting a slot the same width as the spoke in the opposite direction to that which the spoke is pulling against. This way the hub suffers no loss of strength and is in fact how DT and Bontrager build their wheels today except that they are machine cut. Hope this helps you?
Seller's reply:
The holes should NOT be drilled out to accept a blade. These were built by taking a needle file and cutting a slot the same width as the spoke in the opposite direction to that which the spoke is pulling against. This way the hub suffers no loss of strength and is in fact how DT and Bontrager build their wheels today except that they are machine cut. Hope this helps you?