Quick Delivery - Love the Lights ! 
Read reviews and modified product a bit to address the statements made. First - loosen 
off all of the arm lock nuts, and make sure the white and black wires that pass by each knuckle are a bit loose (this is what prevents arms from moving easily).  Second - I put a thin rubber strip between the metal socket base plate, and the portion of the glass shade that gets tightened against it (creates a soft buffer  cleaner looking fit).  Dimmer is great Have had no issues since being installed.  Highly recommend.