If, like me, you cannot afford (or find!) the perfect 1930s/1940s fedora crown block, why not try this idea?:
A cardboard spool of yarn!
Just cover the spool in plastic wrap, stretch the felt over it, then shape as desired! The hat I am currently working on here is not finished (it's drying right now), and I am fashioning it after this lovely little chapeau owned by Julie of Fab Gabs. (Talk about hat envy!!)