Harken 3:1 or 2:1 cunningham system.
These cunningham systems use lightweight low friction carbo blocks. The 396 pivoting block replaces the classic 299 but either can be used.
To complete the 3:1 system as pictured you will need the following hardware:
To make a 2:1 system you will need the following hardware:deck mount and mast mount options.
To trim the cunningham from the cabin top, remove lead block #396 and add a 29mm stand-up block near the mast base. Lead line aft through the stand-up block to a micro cam cleat for easy cabin top trimming.