I must be missing something. I've made all the mods and have no errors. header_tags.php gets written to ok. I've put some meta data against one of my products but it doesn't appear when i 'View Source' for that product in the catalog. It's there in the database and every time I return to that product it's in admin. It just doesn't display on the product_info.php page - and yes, I have put the modded <head> code in.
What am I doing wrong?