Spree 1.1.3 - Deface::Override works fine, DLS doesn't

_cart_form.html.erb.deface

I have placed this file in app/overrides/spree/products/_cart_form.html.erb.deface
Insertion isn't happening. Nothing about it in the output.

<!-- insert_bottom 'span.price' -->
- Free Shipping

This works

Deface::Override.new(:virtual_path => "spree/products/_cart_form",
                 :name => "free_shipping",
                 :insert_bottom => "span.price", :text => " - Free Shipping")