Needle Threader problem


In the process of changing to a stretch needle (Floriani Chrome) my threader hit the shaft and broke the needle. I was able to remove the broken tip and the threader continues to operate, but does not thread the needle. Is there any adjustment I can make or does this require a visit to the tech? Thanks for any help. Up until now the threader has never missed it's mark, and, of course, I'm sick about it.
I have the 15000.

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