diff --git a/src/config/config.h b/src/config/config.h
index d8c6c1c..39af18f 100644
--- a/src/config/config.h
+++ b/src/config/config.h
@@ -8,6 +8,7 @@ namespace config {
 static constexpr const uint8_t toolCount = 5U; ///< Max number of extruders/tools/slots
 
 // Idler's setup
+/*
 static constexpr U_deg idlerSlotPositions[toolCount + 1] = {
     1.0_deg, 2.0_deg, 3.0_deg, 4.0_deg, 5.0_deg, 0
 }; ///< slots 0-4 are the real ones, the 5th is the idle position
@@ -16,6 +17,33 @@ static constexpr U_deg idlerSlotPositions[toolCount + 1] = {
 static constexpr U_mm selectorSlotPositions[toolCount + 1] = {
     1.0_mm, 2.0_mm, 3.0_mm, 4.0_mm, 5.0_mm, 6.0_mm
 }; ///< slots 0-4 are the real ones, the 5th is the farthest parking positions
+*/
+/// Idler steps between neighbor positions: 2 msteps = 180 / 4
+static constexpr uint16_t idlerSteps = 1420 / 4;
+
+/// Absolute positions for Idler's slots: 0-4 are the real ones, the 5th index is the idle position
+static constexpr uint16_t idlerSlotPositions[toolCount + 1] = {
+    idlerSteps,
+    idlerSteps * 2,
+    idlerSteps * 3,
+    idlerSteps * 4,
+    idlerSteps * 5,
+    0
+};
+
+// Selector's setup
+
+/// Selector steps between neighbor positions
+static constexpr uint16_t selectorSteps = 2790 / 4;
+/// slots 0-4 are the real ones, the 5th is the farthest parking positions
+static constexpr uint16_t selectorSlotPositions[toolCount + 1] = {
+    selectorSteps,
+    selectorSteps * 2,
+    selectorSteps * 3,
+    selectorSteps * 4,
+    selectorSteps * 5,
+    selectorSteps * 6
+};
 
 // Printer's filament sensor setup
 static constexpr const uint16_t fsensorDebounceMs = 10;
diff --git a/tests/unit/logic/stubs/stub_motion.cpp b/tests/unit/logic/stubs/stub_motion.cpp
index 7c89e57..8624714 100644
--- a/tests/unit/logic/stubs/stub_motion.cpp
+++ b/tests/unit/logic/stubs/stub_motion.cpp
@@ -1,6 +1,9 @@
 #include "motion.h"
+#include "idler.h"
 #include "stub_motion.h"
 
+namespace mi = modules::idler;
+
 namespace modules {
 namespace motion {
 
@@ -75,8 +78,10 @@ void ReinitMotion() {
 
     // reset the simulation data to defaults
     axes[0] = AxisSim({ 0, 0, false, false, false }); // pulley
-    axes[1] = AxisSim({ selector_pos, selector_pos, false, false, false }); // selector //@@TODO proper selector positions once defined
-    axes[2] = AxisSim({ 0, 0, false, false, false }); // idler
+//    axes[1] = AxisSim({ selector_pos, selector_pos, false, false, false }); // selector //@@TODO proper selector positions once defined
+//    axes[2] = AxisSim({ 0, 0, false, false, false }); // idler
+    axes[1] = AxisSim({ config::selectorSlotPositions[0], config::selectorSlotPositions[0], false, false, false }); // selector
+    axes[2] = AxisSim({ config::idlerSlotPositions[mi::Idler::IdleSlotIndex()], config::idlerSlotPositions[mi::Idler::IdleSlotIndex()], false, false, false }); // idler
 }
 
 /// probably higher-level operations knowing the semantic meaning of axes