I arrived in Santiago this morning from my second
Camino Frances. On my "to do" list was locate and buy machine washable templates for the St. James Cross used on this iconic cake / tart.
After asking in many baking shops and souvenir shops, one lady told me to go to the Ferreteria on Praza Galicia. That is where the bus stop to go to the train station, bus station, and airport is located.
I located Ferreteria El Horreo on the side of Praza Galicia that faces the old town. The address is Horreos 22, which is on the corner.
Go downstairs to find all the kitchen gadgets. These are hanging on a wall peg directly across from the stairs with other, small baking-related gadgets. The templates come in a set of two. Both are stainless steel. One is about 8 inches long. The other is about 5 inches long. The set costs €5.95.
Of course, you need to be in Santiago to do this. Or, you could ask someone who is or will be here to pick a set up for you.
Bon appetit!