--- data-updates.lua.orig
+++ data-updates.lua
@@ -1,17 +1,30 @@
+local RECYCLING_FRACTION = 0.25  -- Fixed recycling return rate from Factorio (hardcoded in game data)
+
 local function replace_ingredient(ingredients, old_ingredient, new_ingredient, new_amount)
-    for i,ingredient in pairs(ingredients) do
+    -- Loop through the list of ingredients/results
+    for i, ingredient in pairs(ingredients) do
         if ingredient.name then
+            -- Full format: {type=..., name=..., amount=...}
             if ingredient.name == old_ingredient then
                 ingredient.name = new_ingredient
-                ingredient.amount = new_amount
+                if new_amount then  -- Set only if provided (for compatibility)
+                    ingredient.amount = new_amount
+                end
             end
         elseif ingredient[1] == old_ingredient then
+            -- Short format: {"name", amount}
             ingredient[1] = new_ingredient
+            if new_amount then
+                ingredient[2] = new_amount
+            end
         end
     end
 end

 local function update_recipe(recipe, old_ingredient, new_ingredient, new_amount)
+    -- Replace in the main crafting recipe (unchanged)
     if data.raw.recipe[recipe].ingredients then
         replace_ingredient(data.raw.recipe[recipe].ingredients, old_ingredient, new_ingredient, new_amount)
     end
@@ -21,4 +34,14 @@
     if data.raw.recipe[recipe].expensive then
         replace_ingredient(data.raw.recipe[recipe].expensive.ingredients, old_ingredient, new_ingredient, new_amount)
     end
+
+    -- Handle the recycling recipe
+    local recycling_name = recipe .. "-recycling"
+    local recycling_recipe = data.raw.recipe[recycling_name]
+    if recycling_recipe and recycling_recipe.results then
+        -- Replace in results with 25% of new_amount (floored)
+        replace_ingredient(recycling_recipe.results, old_ingredient, new_ingredient, (new_amount * RECYCLING_FRACTION))
+    end
+    -- No need for normal/expensive checks — recycling recipes don't have them
 end