thanks to all who replied with info about the bubble q/r being introduced in 1978 as part of several cpsc mandated changes.
the campy timeline indicates that NR and SR were being produced simultaneously for a number of years. it also states that the last year for SR was 1987. did campy conitnue to produce NR until 1987 as well, or did they phase it out before 1987?
ray dobbins
miami florida