diff --git a/src/main/python/ayab/scene.py b/src/main/python/ayab/scene.py
index 6391efdf..9c553a33 100644
--- a/src/main/python/ayab/scene.py
+++ b/src/main/python/ayab/scene.py
@@ -21,7 +21,7 @@
 import logging
 
 from PyQt5.QtCore import QRect
-from PyQt5.QtGui import QImage, QPixmap, QBrush, QColor
+from PyQt5.QtGui import QImage, QPixmap, QPen, QBrush, QColor
 from PyQt5.QtWidgets import QGraphicsScene, QGraphicsRectItem, QGraphicsView
 
 from .image import AyabImage
@@ -36,9 +36,6 @@ class Scene(QGraphicsView):
     @date   June 2020
     """
 
-    BAR_HEIGHT = 5.0
-    LIMIT_BAR_WIDTH = 0.5
-
     def __init__(self, parent):
         super().__init__(parent.ui.graphics_splitter)
         self.setGeometry(QRect(0, 0, 700, 686))
@@ -80,12 +77,16 @@ def refresh(self):
 
         # draw "machine"
         rect_orange = QGraphicsRectItem(
-            -machine_width / 2 - self.LIMIT_BAR_WIDTH, -self.BAR_HEIGHT,
-            machine_width / 2 + self.LIMIT_BAR_WIDTH, self.BAR_HEIGHT)
+            -machine_width / 2 - 0.5,
+            -5.5,
+            machine_width / 2 + 0.5,
+            5)
         rect_orange.setBrush(QBrush(QColor("orange")))
         rect_green = QGraphicsRectItem(
-            0, -self.BAR_HEIGHT,
-            machine_width / 2 + self.LIMIT_BAR_WIDTH, self.BAR_HEIGHT)
+            0,
+            -5.5,
+            machine_width / 2 + 0.5,
+            5)
         rect_green.setBrush(QBrush(QColor("green")))
 
         qscene.addItem(rect_orange)
@@ -94,22 +95,32 @@ def refresh(self):
         # draw limiting lines (start/stop needle)
         qscene.addItem(
             QGraphicsRectItem(
-                self.__start_needle - machine_width / 2 - self.LIMIT_BAR_WIDTH,
-                -self.BAR_HEIGHT, self.LIMIT_BAR_WIDTH,
-                pixmap.height() + self.BAR_HEIGHT))
+                self.__start_needle - machine_width / 2 - 0.5,
+                -5.5,
+                0,
+                pixmap.height() + 5.5))
         qscene.addItem(
             QGraphicsRectItem(
-                self.__stop_needle + 1 - machine_width / 2,
-                -self.BAR_HEIGHT, self.LIMIT_BAR_WIDTH,
-                pixmap.height() + self.BAR_HEIGHT))
-
-        # Draw knitting progress
+                self.__stop_needle - machine_width / 2 + 1.5,
+                -5.5,
+                0,
+                pixmap.height() + 5.5))
         qscene.addItem(
             QGraphicsRectItem(
-                -machine_width / 2 - self.LIMIT_BAR_WIDTH,
-                pixmap.height() - self.__row_progress + self.LIMIT_BAR_WIDTH,
-                machine_width + 2 * self.LIMIT_BAR_WIDTH,
-                self.LIMIT_BAR_WIDTH))
+                self.__start_needle - machine_width / 2 - 1,
+                pixmap.height() + 0.5,
+                self.__stop_needle - self.__start_needle + 3,
+                0))
+
+        # Draw knitting progress
+        grey = QGraphicsRectItem(
+            self.__start_needle - machine_width / 2,
+            pixmap.height(),
+            self.__stop_needle - self.__start_needle + 1,
+            -self.__row_progress)
+        grey.setPen(QPen(QColor(127, 127, 127, 127), 0))
+        grey.setBrush(QBrush(QColor(127, 127, 127, 127)))
+        qscene.addItem(grey)
 
         self.resetTransform()
         self.scale(self.zoom, self.zoom)