diff --git a/cw.py b/cw.py
index c81fa1d..c9d4239 100755
--- a/cw.py
+++ b/cw.py
@@ -28,10 +28,26 @@ y_axis = 16.0
 off_x = -15+18
 off_y = -46+5
 
+#
+# Radius for lead inlets and air escapes
+#
 channel_radius = 1	# mm
-inlet_radius = 7
+
+#
+# Inlets have a large opening on the outside: first a cylinder of radius
+# "inlet_radius" and depth "inlet_streight", then a cone to the channel radius.
+# The cone's height is variable. At the end, there is a channel of length
+# "shaft". The goals are to have a wide opening to make it easy to pour the
+# metal, and to create a buffer for thermal energy.
+#
+inlet_radius = 6.5
+inlet_straight = 3
 shaft = 3
-ymax_piece = 50
+
+#
+# This maximum y dimension of the piece from which the mold is machined
+#
+ymax_piece = 45
 
 total_mass = 0
 total_torque = 0
@@ -106,10 +122,14 @@ def channel(sk, x, y, r0, r1):
     else:
 	cad.cylinder(x, y, 0, r0, shaft)
 	cyl = cad.getlastobj()
-	cad.cone(x, y, shaft, r0, r1, ymax_piece-y-shaft)
+	cad.cone(x, y, shaft, r0, r1, ymax_piece-y-shaft-inlet_straight)
 	cone = cad.getlastobj()
 	cad.fuse(cyl, cone)
 	obj = cad.getlastobj()
+	cad.cylinder(x, y, ymax_piece-inlet_straight-y, r1, inlet_straight)
+	cyl = cad.getlastobj()
+	cad.fuse(obj, cyl)
+	obj = cad.getlastobj()
     cad.rotate(obj, x, y, 0, 1, 0, 0, -math.pi/2)
     cad.cut(sk, obj)
     return cad.getlastobj()
@@ -241,7 +261,7 @@ make_base()
 if __name__ !=  "__main__":
     cad.translate(group, -15, -46, -5)
     cad.translate(group, 18, 5, 0)
-    sk = do_rect_cad(0, 0, 0,  120, 45, 0)
+    sk = do_rect_cad(0, 0, 0,  120, ymax_piece, 0)
     cad.extrude(sk, -10)
     sk = cad.getlastobj()
     cad.cut(sk, group)
@@ -252,6 +272,7 @@ if __name__ !=  "__main__":
     sk = escape(sk, 100-channel_radius, 69)
     sk = escape(sk, 60.5-channel_radius, 65)
     sk = escape(sk, 62.5+channel_radius, 65)
+    sk = escape(sk, 82.5-channel_radius, 65)
     sk = inlet(sk, 50, 65)
 
 print >>sys.stderr, "total mass =", total_mass, "g"