The rivet in the Wave type pocket protector needs a special rivet press/tool. The parts manual, I think, says this. Download the pdf parts listing to see. You may have to go to the Hobie dealer or a sail maker and get them to do it since they have the correct rivet press.
The other option is to use the other type Hobie pocket protector which has the screws if no one local can help. I had to. Unfortunately I had to punch new holes in the sail since the all holes won't line up. But, I could use some of the old holes and the others were covered by the new protector. It didn't appear to weaken the sail fabric. It has worked out ok.
I have an industrial type hole punch called a Whitley punch (google "Whitney punch") that I have from work to punch the holes. Something simpler would work. Like a awl and a block of wood. This is just one route, maybe not ideal but it all still seems strong and I can now replace the protector is it cracks again by just removing screws. Proceed at your own risk with this route...