1st - u can hunt mobs for 3-4 years u wont get a socket (unless weapons)
2nd - lab 4 boss spawns once a day like every lab lvl (1/2/3) boss and usualy drops craps
3rd - there is no socket trick that has been proven b4
So...my dear mates....get hundreds of mets and spam, spam, spam....and sometimes spam more....and u WILL get a socket believe me....even faster then u think.....do GOOD LUCK guys