Circle Editing Opposite Symmetry Points....

 From:  Frenchy Pilou (PILOU)
5128.4 In reply to 5128.3 
For move vertically Click and move on one yellow point of the selection!
If you Click & move without release an helpher line is drawn for help you to keep the vertical
Idem for the corners for the helper lines horizontal

So horizontal with thes corners, Vertical with point, so you can go anywhere :)

EDITED: 11 May 2012 by PILOU