It occurs to me that existing keel bolts might be subject to failure for the same reason that caused the Witchy Woman failure??

:: Yes, Sergey, I thought of the same moficiation but was
:: thinking about someting that would thread wown farther
:: fore and aft than coupling of standard eye bolt. Eye
:: bolt by design seems most efficient for the fabrication
:: and installation cost.
::
:: mb
::
:: :: There are two extra bolts fore and aft of the two bolts
:: :: used for the original strap (it is a common design or
:: :: just my boat?) about a foot apart from each other. I am
:: :: planning to screw an eye nuts on the bolts and them as
:: :: the connection point for redundant spectra strap. The
:: :: idea is that redundant strap will take about 30% of the
:: :: initial load and will secure the boat if the original
:: :: strap had failed. Any comments.