I've found the best way to glue the washers to a nut is spray on contact glue in a can, just a fine spray is enough, spray nuts and washers then press together after a minute, washers inside with a rivet worries me as any imperfection will stop the washer being pulled against the beam until the traveller is under load and then you have a loose rivet, bolting the traveller on is easy but if you want the rivets you could just spray the washers , stick them to the ring spanner and they pull of easily once riveted