Here are some photos of the vang, and the boom-kicker from our 1988 Capri-18.
Attached are some additional photos of the boom vang, and the boom kicker on our Capri-18. It attached to a loop on the bottom rear of the mast tabernackle, and then to a hound on the bottom of the boom. The cleat was to the rear as shown to easily pull the line to tighten the vang. The boom-kicker was nice because it would support the boom when the sail wasn't raised, and actually lifted the boom slightly so when I was running, or wanted a fuller mainsail, is would raise the boom a few inches. But, it was VERY important to pull the boom down level when gybing or tacking so the end of the boom wouldn't hang-up and snag on the back-stay. Also, as the photos show, I installed snap-shackles on both ends of the vang. This simplified rigging and de-rigging, and just made the process just that much easier and quicker.
The Capri-18 is probably one of the best performing overly built small boats out there. She will take much more than you can, trust me. You have a GREAT little boat! Have fun with her!
The one photo shows her moored at Catalina Island. We made two trips to the island with her.
What a GREAT little boat!
Don