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This mod was originally available as part of Facepunch's Night of the Living Update mod pack, but since the site is down I had to move my stuff elsewhere. So yeah
This mod can replace the Spiral Sallet, Prince Tavish's Crown, The Hustler's Hallmark, and/or Demoman's Fro. There are a ton of hats in TF2 now, and I don't want to go through the effort of making it replace every possible Demo cosmetic. So if there's an item you want this mod to replace, suggest it in the comments, and it'll give me an idea on what items most people use.