diff -u -r1.6 -r1.7
--- TrackHelixPlusHitExtrapolator.java	1 Mar 2011 16:26:47 -0000	1.6
+++ TrackHelixPlusHitExtrapolator.java	1 Mar 2011 17:53:28 -0000	1.7
@@ -53,7 +53,6 @@

 	double alpha = Double.NaN;
 	Hep3Vector pointOfClosestApproachToTrackHit = null;
 	Hep3Vector offset = null;

-

 	Hep3Vector positionOfOutermostHit = new BasicHep3Vector(outermostHit.getPosition());
         double rr = Math.sqrt(positionOfOutermostHit.x()*positionOfOutermostHit.x()+positionOfOutermostHit.y()*positionOfOutermostHit.y());
         double z = positionOfOutermostHit.z();

@@ -75,8 +74,9 @@

         {
             offset = new BasicHep3Vector(0.,0.,0.);
             pointOfClosestApproachToTrackHit = positionOfOutermostHit;

+	    alpha = m_swimmer.getTrackLengthToPoint(positionOfOutermostHit);

         }

-        /*

+/*

 	if (outermostHit instanceof  org.lcsim.event.base.BaseTrackerHitMC) {
 	    // This cheated hit has exact 3D info
 	    Hep3Vector positionOfOutermostHit = new BasicHep3Vector(outermostHit.getPosition());

@@ -117,8 +117,8 @@

 	    double z = positionOfOutermostHit.z();
 	    throw new AssertionError("ERROR: Unknown hit of type "+outermostHit.getClass().getName()+" at r="+r+", z="+z);
 	}

-         *
-         */

+ *
+ */

 
 	Hep3Vector momentumAtPOCA = m_swimmer.getMomentumAtLength(alpha);
 	Hep3Vector newPoint = VecOp.add(pointOfClosestApproachToTrackHit, offset);