I did extensive net search on this matter before you posted since I am wanting to install an inner forestay too. You are lucky because you already have connection strongpoints in place; I don't.
Best I could find was two separate articles: one said the inner forestay is normally two sizes smaller than the main forestay. The other said it should be one size smaller.
Okay, so the next question is: what constitutes a "size". Question is further complicated because we do have both metric and imperial sizes in the marketplace. But if we go from say 5/16 down to 9/32, is that a change of one size? or would a change of one-sixteenth represent a change of one size"?
In my opinion, for a 41' boat, one sixteenth should contitute one size. A thirtysecond this way or that way won't matter a damn.
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