tback is correct - the cam cleat is unrelated to the spinnaker halyard.

Incidentally I would love a little more detail on the jib setup, since I've only sailed my boat 2-up once - 2 years ago, and I'm not sure I remember all the details of how that works. And there's a good chance I'll be sailing with crew the weekend after next.

I use one cam cleat to secure the (unused) jib halyard, but I'm clueless about the jib car position. How does that work?