diff --git a/pc4m10.scad b/pc4m10.scad
index 155fc8a..7f1094b 100644
--- a/pc4m10.scad
+++ b/pc4m10.scad
@@ -34,10 +34,10 @@ module pc4M10_inner(back_h=13, back_d = 12, orient=ORIENT_Z, align=V_CENTER) {
 		}
 		down(5.82)difference() {
 			cyl(d=SEAT_DIAMETER, h=SEAT_DEPTH, align=V_TOP);
-			cyl(d=SEAT_HOLE, h=SEAT_DEPTH+.01, align=V_TOP);
+			down(0)cyl(d=SEAT_HOLE, h=SEAT_DEPTH+.02, align=V_TOP);
 		}
 	}
-	down(5.81)cyl(d1=back_d,d2=SEAT_HOLE,h=back_h+.02, align=V_BOTTOM);	
+	down(5.80)cyl(d1=back_d,d2=SEAT_HOLE,h=back_h+.02, align=V_BOTTOM);
 	}
 }
 module pc4M10(cd = 12, h=18.8, orient=ORIENT_Z, align=V_CENTER) {