The easiest way to rotate anything in GSX is F7/F8, which rotates fast, snapped at 15 deg intervals and aligned to the parking. THEN, after you get the general rotation right, use the NumPad 1/2 keys to rotate slowly.
GSX Manual, Page 41 and Page 46.
Hi Umberto, Thanks so much for your efforts and help on this. I learned even more with your directions, cool!
Patricio