>We have had no problems, but I purposely didn't advise as I >can't see your arrangement.
I understand. I was merely seeking normal procedure and I appreciate your help. I try to stay one jump ahead of myself on a project like so as to prearrange the alignment of my ducks. It would be great to find a replacement 380 that had already been upgraded to the double row chain.... or find a good 420 to use as the replacement.