[Rails] Clearly Defined Route Not Found

In routes.rb I have this:

resources :presentations do
post "save_stuff", :on => :member
end

In PresentationsController I have this:

def save_stuff
...
end

And in my form I have this:

<%= form_for @presentation, :url => {:action => "save_stuff"}, :html =>
{:id => "presentationForm", :method => :post} do |f| %>

Yet when an attempt is made to render the above form I get this:

!! Unexpected error while processing request: No route matches
{:action=>"save_stuff", :controller=>"presentations"}

I have been struggling with this for hours, so I could use some help.

Thanks.

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