diff --git a/coal-crafter.lua b/coal-crafter.lua
index 6680869..ee363a7 100644
--- a/coal-crafter.lua
+++ b/coal-crafter.lua
@@ -8,6 +8,12 @@ local MIN_ESSENCE_NEEDED = 8
 local COAL_ESSENCE_NAME = 'mysticalagriculture:coal_essence'
 local COAL_NAME = 'minecraft:coal'
 
+local STORAGE_BUFFER_SIDE = 'bottom'
+local STORAGE_INVENTORY_SIDE = 'front'
+
+local dropInStorageFn = turtle.drop
+local suckFromBufferFn = turtle.suckDown
+
 local function countCoalItems(inventory)
   local total = 0
 
@@ -79,42 +85,38 @@ local function craft()
 end
 
 local function dropSelected()
-  turtle.turnLeft()
-  turtle.turnLeft()
-  turtle.drop()
-  turtle.turnRight()
-  turtle.turnRight()
+  dropInStorageFn()
 end
 
-local function findBufferChestOrientation()
+local function findStorageChestOrientation()
   for i=1, 3, 1 do
-    local inv = turtleUtils.getInventory('front')
-    if inv and #inv.list() == 0 then
+    local inv = turtleUtils.getInventory(STORAGE_INVENTORY_SIDE)
+    if inv then
       return
     end
 
     turtle.turnRight()
   end
 
-  error('buffer inventory not found (empty chest expected)')
+  error('storage chest inventory not found')
 end
 
 local function main()
   turtle.select(1)
 
-  findBufferChestOrientation()
+  findStorageChestOrientation()
 
   print('> Waiting for the back inventory (storage)')
-  local storageInventory = turtleUtils.waitForInventory('back', WAIT_INVENTORY_TIME)
+  local storageInventory = turtleUtils.waitForInventory(STORAGE_INVENTORY_SIDE, WAIT_INVENTORY_TIME)
 
   print('> Waiting for the front inventory (buffer chest)')
-  local bufferInventory = turtleUtils.waitForInventory('front', WAIT_INVENTORY_TIME)
+  local bufferInventory = turtleUtils.waitForInventory(STORAGE_BUFFER_SIDE, WAIT_INVENTORY_TIME)
 
   print('> coal-crafter process started')
 
   while true do
-    storageInventory = turtleUtils.waitForInventory('back', WAIT_INVENTORY_TIME)
-    bufferInventory = turtleUtils.waitForInventory('front', WAIT_INVENTORY_TIME)
+    storageInventory = turtleUtils.waitForInventory(STORAGE_INVENTORY_SIDE, WAIT_INVENTORY_TIME)
+    bufferInventory = turtleUtils.waitForInventory(STORAGE_BUFFER_SIDE, WAIT_INVENTORY_TIME)
 
     waitForNotEnoughCoal(storageInventory)
     local coalEssenceSlot = waitForCoalEssence(storageInventory)
@@ -124,7 +126,7 @@ local function main()
       error('cannot pushItems from storage to buffer')
     end
 
-    local suckOk, suckErr = turtle.suck()
+    local suckOk, suckErr = suckFromBufferFn()
 
     if not suckOk then
       error('cannot suck into front buffer chest: ' .. tostring(suckErr))
@@ -132,7 +134,7 @@ local function main()
 
     prepareCraftShape()
     craft()
-    dropSelected()
+    dropInStorageFn()
   end
 end