Very nice! When I went to Aconcagua, I was more impressed by this peak than by Aconcagua itself. If I ever go back, I hope to include La Mano as well. As with all of your pages, very nice work.
Two argentine climbers went up the Canal Central on La Mano and the information is available here (in Spanish): . It seems the canal is <50° with some 4/4+ (French rock grades) at the exit. That would be AD+... It is really unfortunate that the access to the area through the alto rio Vacas is closed now.