My reasoning is, if you have exposed wire running around a thimble you can do a visual inspection
of the entire wire. The problem with swaged and mechanical fittings is the problems are often inside the fitting or swage. Invisible to the eye the saltwater is sitting inside the fitting with no oxygen (we all know how stainless suffers from corrosion
if not exposed to oxygen) corroding away invisible to the naked eye. Then you have a catastrophic failure like a backstay zinging by your ear from a stay that looked solid to the visual inspection
. Look at the specs for galvanized guy wire compared to the stainless. Size for size the galvanized steel
is rated higher. I havent made the jump yet to galvanized but fully plan on it before I graduate from coastal cruising to offshore
passagemaking. Incidentally for treating my stainless fittings, Ive been experimenting with using lanacote instead of 5200 to treat the fittings. As well as bedding the inside of the mechanical fitting I heavily coat the turnbuckle and the fitting and cable 2 inches up from the fitting. Then wrap a canvas
boot around the whole works. The last time I checked after 4 months of cruising in salt
the turnbuckles and cable ends looked great . After I dissambled the fittings I rinsed them in mineral spirits , recoated and reassembled. If you can get over the barnyard smell the lanacote gives when first applied its by far the best protectant available for saltwater exposed metal.