DIY V-Thread Tool from Wire Hanger
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Ice climbers drill holes into the ice that connect at the back and then run cord or the rope through those holes to make "V-thread" anchors. While there are tricks to fish the cord, runner, or rope from the back of the tunnels, it is far easier to do with a "V-thread tool." Here's how to make a DIY version made from a wire hanger.
Me favorite ice screw for v-threads is the 21cm Blue Ice Aero screw, which can be found here.