He's obviously just repairing it so you won't have to🙄
It'll be a greatly saved $20 if you just try to drive it yourself to see whether the flaps are necessary. For me I can't imagine my boat without those flaps. During my tests with the wings completely up and after gaining speed, every small...
In my boat I can manually flap those wings up and down, and I gain a lot more control when having them down and while doing them all the way up, all I can do is donuts🙃