I own the 803s(newer version) and just replaced my tweeter. On mine all I had to do was take the front tweeter grill off / unscrew the back portion of the tweeter and gently pull the tweeter out. The tweeter is held in by two clips on each side. Used needled nose pliers to reattach. Told less than 5mins.
Damaged B&W Nautilus 803...
I found a pair of B&W Nautilus 803 speakers in which one of the tweeters is broken. The price is $700. Should I make the purchase?