Kalama...I had not thought about that option. I am assuming you mean: untie, add the new backing, put the quilt back together in its new form, and then wash....right? I am willing to do that if that is what is best....anybody else want to weigh in on this?
While you are at it...would I be wiser to SID once the new back is on? Or is tying better, considering that is the technique my sisters used when presenting it to Mom? Any advantages...I could surely hand stitch it together if you all think that would be the wiser route. Any suggestions?