Is this on your 28' Islander? How far forward of the mast is the cutter stay and what is your thinking on addind a cutter stay? Are you plannint to sail the boat as a cutter with 2 foresails at the same time? Usually the runner is as far aft of the mast as the cutter stay is forward or close to this. The runner can be made up of higher tech line which avoids the bend doing damage in the case of stainless runners. Only the windward runner needs to be deployed when needed, usually not an issue in light air.
Depending on the reason you have for adding an inner forestay there might be an easier solution. In a lot of cases the inner stay is added to boats with furling jibs so in rough weather a smaller jib than a reefed furler can be set. If this is the case the easier solution is a solent stay. A solent stay is just aft of the forestay and parallels it. Because it is attached so close to the bow and so close to the masthead it doesn't require runners at all. Also because the stay is attached so close to the bow it doesn't require an internal tie rod to the hull in the forecabin. It is a removeable stay. It also makes sense with any removeable stay to use 7x19 wire as it is more flexible and less subject to kinking.
Last edited by mitiempo; 11-24-2009 at 12:33 PM.