The spinnaker sheet proved to be too hard to hold. I tried using a cleat, but it was awkward. The sheets are now each run through one of these automatic ratchet blocks. The ratchet only engages when they have a load applied. Interestingly, the attachment is a Kevlar loop. The other line attached to this eye is the mainsheet bridle.
The light line to the cleat goes to the tiller tamer.