Plumb This

Today I replaced the fill value in my toilet. What's a fill value you ask? Its the component in the water reservoir (or tank) that fills the tank with water once you flush. Let me set the record straight ... plumbing sucks! BTW ... I rent! So, when I informed my landlord of the problem, he asked that I try to fix it and proceeded to tell me that it would cost him close to $300 to have someone come by and fix it. Long story short, he didn't have the loot! Hmmm ... where's my security deposit at??? Do we sign another year lease???