My sons were experimenting with pinning up there wool felt blank round crown hats and arguing about what was correct or not. You could pin up three points and make a tricorn or pin up the rear as I've seen in some pictures. but one of my boys pinned up the sides and ended up with a brim in front. Works great and I'm thinking of doing the same but can't find any pictorial documentation for it. Is there total flexiblity on how you can modify and customize your hat and still be HC?