727 one bad clutch plate. Input to output washer half gone

The word "index" is going to complicate the procedure in noobs' minds. Does this mean that each plate has numerous indices? NO. they're simply splined together; not ever indexed. Is a converter properly indexed with a pump? A driveshaft yoke properly indexed with an output shaft? NO. An intermediate shaft properly indexed in a th400...SOMETIMES...it only goes together one way; unlike clutch splines.