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Being 1080 and annealed, you're dealing with dull bits. Probably hardened your spot as described previously. Just take a torch (lp will work) and heat the tang area to cherry red then let air cool (hold with pliers until cool to touch). Center punch from other side at pin location then use a sharp bit to cut your hole. No need for expensive carbide bits for 1080 series steel that's not been HT'd.
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Carl Rechsteiner, Bladesmith
Georgia Custom Knifemakers Guild, Charter Member
Knifemakers Guild, voting member
Registered Master Artist - GA Council for the Arts
C Rex Custom Knives
Blade Show Table 6-H
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