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@andyp
Chasing the bottom bracket threads is common practise on a new frame to ensure the thread is clean and evenly cut. It sounds like your BB needs it, hence the one you're trying to install stopping after half a turn. You can do it yourself (and here's a video showing you how - Facing /Chasing the Threads on the Bottom Bracket - Video) but it's probably best to get a decent bike shop to do it for you.