I'm not getting this fully. Your pic's show a hole at mast base. Then another with sheave in the mast track, but up from the base several feet. Are you saying there is a tube between those points (i.e. diagonally from base to sheave)?

Then Halyard goes up mast track with the mainsail luff bolt rope. But how are you going from the track to the mast leading edge at the top point? Another tube horizontally with a sheave at each end to turn the halyard two 90 degrees turns? Have you considered making a strop & bail setup like most other spinny setups to decouple load on halyard from de-rotating the mast?


How does your halyard cleat release work? Your pic seems to show a line that pulls one side of the cam cleat open. Does this mean you must hold that trigger line tight all the time while dousing the sail (to keep the cam pulled off the line)? Did you consider a SpinLock instead of camcleat here? Once open via a trip line, it would stay open on its own.

The pole stays look trick. But for practical reasons I'd prefer spectra. One good bump at a mark rounding/startline or at the dock and your day/wallet is done!

Mike.