How-to: how do you sharpen a gut hook?

Knife Sharpening Guide Jantz Supply - Knife Making Since 1966

so i've never fielddressed a deer without a gut hook, but seems

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1: Light - A tiny lightweight sharpener with medium grit, you can keep in your survival kit or car or tackle box to sharpen up your pocket knife, box

Portable Diamond Sharpening Rod with medium grit, For Sharpening Fish Hook, Gut Hook and Pocket Knife - 2 Packs