Join Date: Feb 2012
Location: New Orleans Louisiana
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Re: Chainplate Re-locating
The wider the base the lower the shroud loads, since the lever arm grow. The downside is that the sheeting angle for the headsail must also move outboard, reducing pointing ability, or requiring getting rid of a big jib and switching to non-overlapping small headsails.
Moving them either direction also supposes that their is a hard point that is suitable to attach them too. Mounting them to the sides of the boat, absent internal support, won't work. The unsupported sides are not likely strong enough to support the loads, and moving them inboard almost always means there is nothing to attach them too.
Either way you need the ok of a NA, absolutely all new rigging, spreaders, chainplates, ect. Moving inboard you may also need a new mast to handle the increased compression loads, and a new compression post if the mast is deck stepped. Worst case you could also need to rebuild the mast-keel tie if it isn't strong enough.
Frankly moving major structural elements like this needs a NA, and it is usually cheaper and easier to just replace the boat with one that doesn't have the problem.