I was wondering... When you have a T90 upgraded to accept a PC plug, where do they put this contraption? Do they actualy put a new hole in the body or is it a part that slips into the how shoe or what? I am looking into buying a Canon T90 and I own a Sunpak 544 (which is not only no dedicatable but requires the use of a PC socket) Are there any places that can still upgrade a T90 in this way or am I better off selling my 544 and getting a 555 or a 522? If so, does anyone have any recomendations on which flash to go with?