diff --git a/src/main.rs b/src/main.rs
index dedbbca..a872d40 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -84,7 +84,7 @@ fn main() {
 
     let mut test = ScadFile::new();
     let test_airfoil = SeligFile::parse(include_str!("../m1-il.dat"));
-    let wing = wing(&test_airfoil, &RUDDER, SparType::Center);
+    let wing = wing(&test_airfoil, &RUDDER, SparType::Top);
     test.add_object(scad!(NamedColor("clear-blue".to_string()); wing.0.visualization));
     test.add_object(scad!(NamedColor("clear-red".to_string()); wing.1.visualization));
     test.write_to_file(String::from("build/testwing.scad"));
@@ -248,7 +248,8 @@ fn strut(airfoil: &SeligFile, chord: f32, width: f32, spar: &SparType) -> Constr
     let scaled = scad!(Scale(unit * chord); shape);
     parts.push(scaled.clone());
     let mut strut = scad!(LinearExtrude(extrude); scaled);
-    strut = scad!(Rotate(-90.0, vec3(1.0, 0.0, 0.0)); strut);
+    strut = scad!(Translate(vec3(0.0,0.0,-width)); strut);
+    strut = scad!(Rotate(90.0, vec3(1.0, 0.0, 0.0)); strut);
     Construct {
         visualization: strut,
         parts,
@@ -276,6 +277,7 @@ fn extrude_strut(
     let unit: Vector3<f32> = Vector3::new(1.0, 1.0, 1.0);
     let scaled = scad!(Scale(unit * chord); shape);
     let strut = scad!(LinearExtrude(extrude); scaled);
+    let strut = scad!(Translate(vec3(0.0, 0.0, -width/2.0)); strut);
     let rotated = scad!(Rotate(90.0, vec3(1.0, 0.0, 0.0)); strut);
     rotated
 }
@@ -374,7 +376,7 @@ fn topwing_spar(
 
         let spacing = strut_idx as f32 * gap;
 
-        let shape = topspar_negative(aerofoil, chord, 0.1..0.6);
+        let shape = topspar_negative(aerofoil, chord, TOPSPAR_RANGE);
         let extruded = extrude_strut(shape.clone(), scad!(Union), CARDBOARD_WIDTH, chord);
 
         let mut transform = scad!(Translate(vec3(0.0, spacing, 0.0)));