For use with 5/8" nylon? So not a rigging use then, but for anchor gear you'd not want bronze anyway and it's hard to see a reason for bronze in rigging/arborist/construction use.
Speaking of keepers, I make up mooring and anchor gear with both SS and galvi thimbles without keepers and have not had problems with an eye so poorly made that it streatched out enough to jump the thimble. Sometimes, if you reasonably expect the cordage to outlast the thimble, you might make a larger eye and sieze the throat and a bit of each leg, thus facilitating changing thimbles every year or so.
So, just wondering if perhaps you'd share more of why this unusual need.
G'luck
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