diff --git a/vtm/src/org/oscim/renderer/elements/ExtrusionLayer.java b/vtm/src/org/oscim/renderer/elements/ExtrusionLayer.java
index 3622b163..82ead73a 100644
--- a/vtm/src/org/oscim/renderer/elements/ExtrusionLayer.java
+++ b/vtm/src/org/oscim/renderer/elements/ExtrusionLayer.java
@@ -81,7 +81,7 @@ public class ExtrusionLayer extends RenderElement {
 		mIndices = new VertexData[5];
 
 		for (int i = 0; i <= IND_MESH; i++)
-			mIndices[i] = VertexData.get();
+			mIndices[i] = new VertexData();
 
 		mClipper = new LineClipper(0, 0, Tile.SIZE, Tile.SIZE);
 	}
@@ -104,7 +104,7 @@ public class ExtrusionLayer extends RenderElement {
 		mGroundResolution = groundResolution;
 
 		mIndices = new VertexData[5];
-		mIndices[4] = VertexData.get();
+		mIndices[4] = new VertexData();
 
 		synchronized (vertexPool) {
 			mVertexMap = vertexMapPool.get();
diff --git a/vtm/src/org/oscim/renderer/elements/VertexData.java b/vtm/src/org/oscim/renderer/elements/VertexData.java
index 5d2b7d1c..39314266 100644
--- a/vtm/src/org/oscim/renderer/elements/VertexData.java
+++ b/vtm/src/org/oscim/renderer/elements/VertexData.java
@@ -25,11 +25,26 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
+ * A linked list of array chunks to hold temporary vertex data.
+ * 
  * TODO override append() etc to update internal (cur) state.
  */
 public class VertexData extends Inlist.List<Chunk> {
 	static final Logger log = LoggerFactory.getLogger(VertexData.class);
 
+	/**
+	 * Size of array chunks. Must be multiple of:
+	 * 4 (LineLayer/PolygonLayer),
+	 * 24 (TexLineLayer - one block, i.e. two segments)
+	 * 24 (TextureLayer)
+	 */
+	public static final int SIZE = 360;
+
+	/**
+	 * Shared chunk pool size.
+	 */
+	private static final int MAX_POOL = 500;
+
 	public static class Chunk extends Inlist<Chunk> {
 		public final short[] vertices = new short[SIZE];
 		public int used;
@@ -78,16 +93,8 @@ public class VertexData extends Inlist.List<Chunk> {
 		return super.clear();
 	}
 
-	private static final int MAX_POOL = 500;
-
 	private final static Pool pool = new Pool();
 
-	/* Must be multiple of
-	 * 4 (LineLayer/PolygonLayer),
-	 * 24 (TexLineLayer - one block, i.e. two segments)
-	 * 24 (TextureLayer) */
-	public static final int SIZE = 360;
-
 	public void dispose() {
 		pool.releaseAll(super.clear());
 		used = SIZE; /* set SIZE to get new item on add */
@@ -184,11 +191,11 @@ public class VertexData extends Inlist.List<Chunk> {
 		used += 6;
 	}
 
-	public static VertexData get() {
-		return new VertexData();
-	}
-
-	/** When changing the position releaseChunk to update internal state */
+	/**
+	 * Direct access to the current chunk of VertexData. Use with care!
+	 * 
+	 * When changing the position use releaseChunk to update internal state
+	 */
 	public Chunk obtainChunk() {
 		if (used == SIZE)
 			getNext();
@@ -201,16 +208,16 @@ public class VertexData extends Inlist.List<Chunk> {
 		used = cur.used;
 	}
 
+	/* Do not use! */
 	public void seek(int offset) {
 		used += offset;
 		cur.used = used;
 
 		if (used > SIZE || used < 0)
-			throw new IllegalStateException("seekkeed: " + offset + ":" + used);
+			throw new IllegalStateException("seeked too far: " + offset + "/" + used);
 	}
 
 	public boolean empty() {
 		return cur == null;
 	}
-
 }