Hello, I have a set of spectra racing sails built for a foil which I converted just by installing grommets and hanks myself. I have used them for many years with no problem apart from the brass grommets eventually corroding , especially the lower ones that get wet with salt water. Stainless ones like a sailmaker uses would be better but it´s not a major problem. Best way is to use an extra piece of sailcloth at each grommet but again not really important. Common sense gives the right sizes, I prefer a slightly smaller hank than the usual size. Better than hanks , use wichard hooks, hard to find with the correct fitting , means you can attach and remove them with one hand.