Add another cylinder and move it up to the top of the lightsaber. Scale it along the z axis again so you get something like in pic 1. Add yet ANOTHER cylinder( :P ), scaling it normally and along the z axis until you get something like in pic 2. Once you've done that, click shift-d to duplicate the cylinder, and move it like in pic 3. Click shift-a, but this time add a cube instead of a cylinder. Click g (for grab), and move it away from the lightsaber. Click a, then b, click-dragging to select the top right vertices. You should have something like in pic 4. Move the selection along the z axis a bit, using the blue arrow. Click b to select the whole cube, then click s to scale it. You should have something like in pic 5 now.