I sewed a reef into my Siren 17 sail today. I ended up using 5 grommets. The reef is about 3’ from the foot of the sail.
I started by cutting 10 5” squares of sailcloth. It is actually left over from the from the same sail I cut up to make this one.
I marked the sail where I wanted the grommets and stuck the squares to each side of the sail with double sided tape. The same double sided tape that Sailright.com sells. Then I sewed around the outside of each square. After the sewing was done I cut holes in the middle of each square and installed a grommet.
I tried to use the punch cutting tool that came in the grommet kit but it wouldn’t cut through any layers of the sail cloth…