diff --git a/build.py b/build.py
index 54e2340..7131e9a 100644
--- a/build.py
+++ b/build.py
@@ -3,11 +3,11 @@ from build123d import *
 
 center_thickness = 10
 
-mop_diameter = 40
-mop_arc_size = 180
+mop_diameter = 23.7
+mop_arc_size = 220
 
-scraper_diameter = 40
-scraper_arc_size = 180
+scraper_diameter = 20.55
+scraper_arc_size = mop_arc_size
 
 arms_thickness = 5