Probably depends on your size and your objective. Some sailors don't mind the slow wind drifting and use it to work on improving their light wind sailing tactics.
I'm personally not a racer, and am a bigger guy (245 lbs), so find those light wind days a tad dreadful. I'd rather a stiff breeze...
do you want the old wooden one? you can probably just make it from a scrap of wood.
Intensity Sails does sell a wooden one Parts & Sails for The Sunfish®
but they also sell several options with the rubber universal joints that offer a lot more flexibility than the bolted on wooden one.
News article - Sailors from around the world gather in Panama City for Sunfish World Championship regatta
On the water photo from Jonathan Martinetti Jonathan Martinetti on Instagram: “Otro día de poco viento pero clasificado a los Juegos Sudamericanos Cochabamba 2018 en la clase Sunfish...
for significant cracks, you can drill a hole and epoxy in a threaded rod. I did this on a few pieces a while back (detailed it here: sunfish rudder and daggerboard repair – progress) - the photo is a Super Porpoise rudder with a lead weight, but I used the same method on several pieces.
Great news - an update from the Class President and World Sailing:
International Sunfish Class Association
“World Sailing cannot accept a rival international class association being created without the consent of the current class. Doing so fundamentally undermines the Class’s membership of...