diff --git a/public/js/webgl-book-shape-lab.js b/public/js/webgl-book-shape-lab.js
index 441949a..c241e32 100644
--- a/public/js/webgl-book-shape-lab.js
+++ b/public/js/webgl-book-shape-lab.js
@@ -51,6 +51,7 @@ const BOOK_PROFILE = {
     coverThickness: 0.03,
     raisedHingeY: 0.056,
     paperContactOffset: 0.0012,
+    singlePageCoverGap: 0.006,
     bundleSpacing: 0.014
 };
 
@@ -699,7 +700,7 @@ function createSinglePageBodyLines(line) {
     const bundleCount = Math.max(4, Math.round(pageCount / 10));
     const supportPoints = line.points.map((point) => ({
         x: point.x,
-        y: Math.max(coverTopYAtX(point.x) + coverClearance(bundleCount), point.y - BOOK_PROFILE.bundleSpacing)
+        y: Math.max(coverTopYAtX(point.x) + coverClearance(bundleCount) + BOOK_PROFILE.singlePageCoverGap, point.y - BOOK_PROFILE.bundleSpacing)
     }));
     return [
         { ...line, points: supportPoints, endpoint: supportPoints[supportPoints.length - 1] },
@@ -732,17 +733,10 @@ function createLoftedLineBody(lines, depth) {
         indices.push(front[row + 1][last], back[row + 1][last], back[row][last]);
     }
     for (let col = 0; col < smoothLines[0].length - 1; col += 1) {
-        const bottomRow = 0;
         const topRow = smoothLines.length - 1;
-        indices.push(front[bottomRow][col], front[bottomRow][col + 1], back[bottomRow][col]);
-        indices.push(front[bottomRow][col + 1], back[bottomRow][col + 1], back[bottomRow][col]);
         indices.push(front[topRow][col], back[topRow][col], front[topRow][col + 1]);
         indices.push(front[topRow][col + 1], back[topRow][col], back[topRow][col + 1]);
     }
-    for (let row = 0; row < smoothLines.length - 1; row += 1) {
-        indices.push(front[row][0], back[row][0], front[row + 1][0]);
-        indices.push(front[row + 1][0], back[row][0], back[row + 1][0]);
-    }
     const geometry = new THREE.BufferGeometry();
     geometry.setIndex(indices);
     geometry.setAttribute('position', new THREE.Float32BufferAttribute(positions, 3));