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Replaced all the original "sacrificial" hose clamps from overflow tube and coolant reservoir with these hose clamps. Got them from auto parts as "fuel injector" hose clamps. Figured if good enough for fuel good enough for coolant, absolutely no leaks yet.
New as in two months ago, although I did inspect it before reconnecting hoses, and all was good. When I fabricated and installed my custom hose T the whole system was flushed.