I´ve just installed 10x WS-C2960-48TC-L and 01x WS-C2960-24TC-L using GLC-SX-MM SFP modules, and in all (absolutely all of them) the SFP doesn´t fit really well... it´s kind of loose in the SFP bay, it looks like that either the SFP are manufactured too small or the SFP bay too big, because anytime we touch the fiber cable on those switches the SFP pop´s out, loosing the connection to the CORE.
Also tested in a 3750, and it fits better (not perfectly, but better), at least it doesn´t pop out when touching the fiber cable...
My question is, anyone faced this issue already?! Any official word from Cisco about this issue?!