diff --git a/README.md b/README.md
index 39d3585..247717d 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,10 @@ Testbestellungen fuer `crushing`, `saw:1` und `saw:2`. Pro Verarbeitungslinie
 bleibt nur ein Auftrag aktiv, bis sein Ergebnis im Lager erkannt wurde. Er
 steuert noch keine Clutches oder sonstigen Redstone-Ausgaenge.
 
+Als erster generischer Fan-Prozess ist `fan:washing` enthalten. Der Testauftrag
+verarbeitet 64 vereinheitlichte Zinc Clumps zu mindestens 576 Zinc Nuggets; das
+zufaellige Gunpowder-Nebenprodukt erscheint automatisch in der Lagerliste.
+
 ## Zielbild
 
 - zentrale Leitwarte fuer Status, Energie, Alarme und Sektor-Hauptschalter
diff --git a/create_factory_test.lua b/create_factory_test.lua
index e726f8f..4116750 100644
--- a/create_factory_test.lua
+++ b/create_factory_test.lua
@@ -60,6 +60,20 @@ local actions = {
             outputPerInput = 6,
         },
     },
+    {
+        id = "wash_zinc_clumps",
+        label = "576 ZINC NUGGETS",
+        lockKey = "fan:washing",
+        address = "fan:washing",
+        item = "alltheores:zinc_clump",
+        -- Washing yields 9 nuggets per clump and has a 25% Gunpowder byproduct.
+        inputCount = 64,
+        completion = {
+            mode = "expected",
+            output = "alltheores:zinc_nugget",
+            outputPerInput = 9,
+        },
+    },
 }
 
 local function findPeripheral(wantedType)
@@ -240,15 +254,17 @@ local function drawStockPage(width)
     stockPageButtons[#stockPageButtons + 1] = {
         direction = -1,
         x1 = 1,
-        x2 = math.floor(width / 3),
-        y = 3,
+        x2 = math.floor(width / 2),
+        y1 = 3,
+        y2 = 8,
         enabled = stockPage > 1,
     }
     stockPageButtons[#stockPageButtons + 1] = {
         direction = 1,
-        x1 = math.ceil(width * 2 / 3),
+        x1 = math.floor(width / 2) + 1,
         x2 = width,
-        y = 3,
+        y1 = 3,
+        y2 = 8,
         enabled = stockPage < stockPageCount,
     }
 
@@ -338,12 +354,16 @@ local function render()
     local xRight = xLeft + buttonWidth + gap
     local buttonHeight = 2
 
-    drawButton(actions[1], xLeft, buttonTop, xLeft + buttonWidth - 1, buttonTop + buttonHeight - 1)
-    drawButton(actions[2], xRight, buttonTop, xRight + buttonWidth - 1, buttonTop + buttonHeight - 1)
-    drawButton(actions[3], xLeft, buttonTop + 3, xLeft + buttonWidth - 1, buttonTop + 4)
-    drawButton(actions[4], xRight, buttonTop + 3, xRight + buttonWidth - 1, buttonTop + 4)
+    for index, action in ipairs(actions) do
+        local column = (index - 1) % 2
+        local actionRow = math.floor((index - 1) / 2)
+        local x = column == 0 and xLeft or xRight
+        local y = buttonTop + actionRow * 3
+        drawButton(action, x, y, x + buttonWidth - 1, y + buttonHeight - 1)
+    end
 
-    local logTitleRow = math.min(height - 4, buttonTop + 6)
+    local actionRows = math.ceil(#actions / 2)
+    local logTitleRow = math.min(height - 4, buttonTop + actionRows * 3)
     writeAt(2, logTitleRow, "Letzte Ereignisse:", colors.yellow)
     for index, message in ipairs(messages) do
         writeAt(2, logTitleRow + index, message, colors.lightGray)
@@ -417,7 +437,8 @@ end
 
 local function handleTouch(x, y)
     for _, pageButton in ipairs(stockPageButtons) do
-        if y == pageButton.y and x >= pageButton.x1 and x <= pageButton.x2 then
+        if y >= pageButton.y1 and y <= pageButton.y2
+            and x >= pageButton.x1 and x <= pageButton.x2 then
             if pageButton.enabled then
                 stockPage = stockPage + pageButton.direction
                 statusText = "Lagerseite " .. tostring(stockPage) .. "/" .. tostring(stockPageCount)