Chain oops
 

Just replaced chain and sprockets. Forgot toe outer o rings. Crap. Chain seems to run straight and true. Good rivets on pin. What is the consequence?

Order another replacement rivet link and redo, as you'll have a weak link;-) that potentially will prematurely wear.

Yeah, you need another master to redo it, you cant undo the flaired ends but look at the practice you got. Should be a breeze next time.