help!

[sane99]

hey can anyone help me i have rep rolex dd the watch is very nice but it recently stoped ticking i can get it open and stuff but im really not sure what i am doing.... i had to tighten the wieght 2 months ago it was lose but i see the gears spinnig so i dont think that is it... if anyone can tell me maybee a common thing to look for or any help at all that would be great thanks guys ..

jon