I suspect the inverted flare "port" was damaged and the "rebuilder" bored it out and installed the (incorrect) adapter.
A couple of years ago I installed a "rebuilt" booster and it had a similar adapter that fit the brake line but wouldn't seal to the booster itself, a close look revealed a botched threading job.
Had to return the booster for another which was OK.
Suggest you try again, as well.
The other possibility is that the rebuilder didn't have a "core" for your type of booster and used a core that was originally made to accept a "banjo fitting" at that port and made a failed attempt to adapt it to build the part number unit you require.
Either way, they failed to provide you with a functional replacement for your specific application.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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