Mixer tap ring sheared during seal replacement - how remove plumbing advice

Mixer tap ring sheared during seal replacement - how remove In serious trouble here, was going to replace seals around base of mixer tap spout as it was stiff to rotate. Allen removed ok, but spout very difficult to remove, but working it back and forth got it out. But a part has sheared and is stuck in tap base. How on earth I am going to get this piece out. Boy am I in the dwang!

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