the photo was very bad.......but
I have a tool "very similar" to that and it is reffered to as a seam roller.
i got it at a store that sold wall paper supplies.
What i would do is lay the crown pattern out and cut out of the center of the pattern from left to right the amount you want to lower the crown and then tape it back together,
the top and where the crown attaches to the brim remains the same.
GO TO hOBBY LOBBY.....MICHAELS OR YOUR FAVORITE CRAFT STORE and buy a wooden box.
cut the leather out that will match all sides -top and bottom glue the leather pcs on
and then sew all together.