I'm trying to add the cross-sells to the single product page instead of the up-sells. I tried:
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15 );
add_action( 'woocommerce_single_product_summary', 'woocommerce_cross_sell_display',40);
...but that doesn't work. Does anyone know? I can't find anything on working with the cross sells hook.