On my Capri 22 I have internal halyards that all run back to the cockpit from the mast. In my case there are sheaves about 4" above the base of the mast; the halyards come out there, back toward the stern at about a 45 degree angle, hit another pair of sheaves mounted on the hatch frame and then run back to spinlock cleats on the cabin top just forward of the jib winches.
Main on the left, jib & spinnaker on the right. Empty slot on the left is for the spinnaker topping lift which I don't use.
Is it worth it? Definitely since nobody has to go on deck to raise the main. Someone has to go up there for the jib, since I use a foil, but if it's too windy for them to be up there we'll just sail with a reefed main anyway.
Personally I wouldn't go with this type of spinlock cleat again. I want something with a bit more positive latch as we've inadvertently dropped the main and jib when someone bumped the cleat and it popped open.
We have a couple of Capri 18's at the lake but I've never noticed how their halyards are rigged. Since it's winter the lake has been drained (flood control) so I can't go look for you.
Here are some photos of how I accomplished this on our Capri-18. Now, this was a 97 model, with the factory mast raising system. As you can see in the pictures, I attached eye-nuts to the baby-stay mounts for the mast raising system. I simply took one off a machine screw and turned it around. This brought the line smoothly down, and let it turn to the cockpit. The line was just above the hatch rails. I like things simple, cheap, and effective. I used jam-cleats from Catalina Direct. They match the factory original hardware, and are inexpensive. They work very well with no slipage. As you can see, I had two cleats on each side of the cabin top. The additional cleats are used for single line reefing and mainsail cunningham. Take your time and drill the holes properly, and seal the hole with epoxy to prevent the plywood core from getting wet and causing problems. Go to the WEST Epoxy web site for their instructions on how to seal mounting holes through fiberglass with a wood core. Another thing that I do is use different colored lines for different functions. This way in the heat of the battle, if I have a green-horn onboard, I just tell them to pull on the red line, or loosen the black line. We'll use the proper terms later, plus, it looks cool! The Capri-18 is a fantastic boat, and will take more than you can. Go to my albums section in my profile and you'll see a lot of photos of the boat.
Don
I have had regular cam cleats jam in a thunderstorm micro-burst, though this was on a J22 with a halyard winch, thus a really tight halyard. So. I don't trust the cam for the main halyard. Sailing in a highly variable wind area, I feel that I need to be able to guarantee that the main can be released now. Even though pricey, I have a full-on Lewmar clutch for the halyard. They ALWAYS release.Thanks, the spinlock cleats are a little pricey I'm told . It looks like a regular cam cleat would do the trick !
paul