M2M Ordering in Admin

I am creating an application for displaying decks of slides. Each
slide may be in more than one deck. Order of the slides in a deck
matters. So, I have a many to many relation.

class Slide(BaseModel):
"""Represents a slide in a slide deck for a display""

class Deck(BaseModel):
name = models.CharField(max_length = 45, unique=True )
slides = models.ManyToManyField(Slide, through='DeckSlides')

class DeckSlides(BaseModel):
deck = models.ForeignKey(SlideDeck)
slide = models.ForeignKey(Slide)
slide_position = models.PositiveSmallIntegerField()

I am trying to figure out how I can use Admin to both select slides
for a deck (which is already provided by the default M2M control) and
set the ordering of the slides in the Deck (not provided by default
for an M2M in admin). I'm guessing people have had to face this
before. I've googled it but am not finding a solution.

Thanks

br

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