Photoshop :: How To Move Both Handles Symmetrically After Initial Point Set

How can I move both handles symmetrically after the initial point is set?
 
pen tool:
 
1) drop a point
2) drop another point and drag (both handles move symmetrically in distance from point and angle)
3) finish your shape
4) switch to Direct Selection Tool
5) select one of the new points and move the handles (angle changes but distance from does not)
 
Here's a quick vid

[URL].........
 
I run in to this all the time.  I'll quickly set top of a curve, make a mistake and then want to go back and symmetrically extended both handles.  Right now I have to set the distance on each side independently and it's never perfectly symmetrical again.