No problems, I've also ordered a set of these too. They're described as NOS 50's stepdown ferrules. Ebay 252178310873
late to the party but I would recommend those stepped ferrules, as I had them as replacements on my Lenton.
From what I remember there were some casting/forming marks on them that scraped off easily and then they went on a worked, no trouble.
Ah, good to hear that they're the real deal then!
@Ecobeard started
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No problems, I've also ordered a set of these too. They're described as NOS 50's stepdown ferrules.
Ebay 252178310873