automator pass files to terminal for permissions change

I'm looking to setup an Automator actions to run on a folder change, to set all files only with all subfolders to read only... but leave the folders as read/write so additional files and folders can still be added...

so far i have:

Get Specified Finder Items > selected the folder I wanted to change file permissions in

Get Folder Contents

Filter Finder Items > Find files where None are Kind = Folder

Set Value of Variable > Files

Run shell script > Shell: /bin/bash , Pass Input: to stdin

chmod 444 "$1"

but no success...

any suggestions...