Sounds like a clear warranty issue.
Quailty of steel used in the windsurfing industry is not always the best. For instance, the ridges on my Tiki tool screw driver bent and were scraped down only from a few screws driven. This also resulted in rounded of screw heads now difficult to tighten properly. I went to a hardware store to pick up a quality $20 Philips # 3 screwdriver, massive differenct to the Tiki tool, not even comparable.
It's irritating and provoking that producers of our expensive gear are shortsighted enough to include crap screws and crap screw drivers. It's important that they learn that by doing this it will cost them much more in the long run. So please stop using cheap, soft crap chineese steel in our windsurfing products.