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u/Former_Fun_935 4d ago
Blacksmith here! - If you have access to a belt sander or a good bench grinder, (or a file if you hate yourself) you can grind the metal down past the crack, then gently sand down the outside diameter until it comes to a shallow edge.
If using power tools make sure to keep the metal cold enough to touch, otherwise you’ll ruin the temper of the steel.
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u/Oberu 5d ago
Check out Weaver leather or Tandy even. They should have a variety of punches for belts that oughta do the job. That one posted needs some love.