Use Armors.xlsm to check the chest armor types and their ComboCategory. Makes muuuuuuuuch more sense.

I checked the recipes and there is 1 recipe that calls for Plate Scraps and no recipes that call for Scale Scrap (why?). So, we only need 1 recipe for the Metal Scraps.

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You use TOOL_RepairHammer instead of TOOL_Hammer_Repair_A.