Thanks Brion,
"The question is whether to do this above or below the old ones. How close to the spreaders are the old ones?"
These are the intermediates, alongside the forestay, well above the spreaders (the lowers attach to tangs just below the spreaders).
So how about using the original oval hole for the T-ball, with a new thru-bolt and compression sleeve, and have the shear load carried on a good sized bearing plate riveted (?) to the exterior of the mast wall?
I forgot to mention in my original post that I'd also like to add running backstays; would it be appropriate to hang tangs for those on the new thru-bolt?
Thanks
LC
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