My friend Fred helped me cut the hinges down to size. He used a cutter on the mill since neither of us had a better way to cut it.
Cutting off the excess saved 6oz per hinge for a total of 3/4lb saved. That might not seem like much until you consider the whole airplane must be under 278lbs.
To better understand why saving 12oz is important, my altimeter alone weighs 10oz. Every ounce saved is an ounce I can use for improvements.