I took apart my H120 to replace the screen and when I put the entire player back together I ended up with an
extra 
tiny rubber piece. For the life of me I don't remember where it goes.
The rubber piece in question is about 0.25 x 0.25 inch (~6mm) and has two tiny holes on the left and right. The rubber is the same type rubber the gasket that goes over the HDD is made of. Any idea where this is supposed to go?