fix screw dimensions

amp_case.py

@@ -151,12 +151,12 @@ result = (
 
 top = (
     Workplane()
-    .box(amp_length, amp_width + side_width, top_width)
+    .box(amp_length, amp_width + side_width - 1, top_width)
-    .center(-10, -(amp_width / 2) - (0.8 / 2))
+    .center(-10, -(amp_width / 2))
     .workplane(offset=-1.0)
-    .line(0, amp_width + 0.8, forConstruction=True)
+    .line(0, amp_width, forConstruction=True)
     .vertices()
-    .box(amp_length - 20, 1.5, 1.5)
+    .box(amp_length - 20, 1.4, 1.6)
 )
 
 result = result.cut(back_screws)