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Dave, I don't think you need a masthead crane to rig a spinnaker halyard for a C25. We discussed that previously. The following hyperlink will take you to that discussion. In the fourth reply, John P. provides a photo showing how to rig it.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.