You need the tool with the tooth on the spanner, then it just unscrews in the normal way. You can bodge it with stilons if you are lucky, but that usually gouges the frame at the same time.
@deleted started
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You need the tool with the tooth on the spanner, then it just unscrews in the normal way. You can bodge it with stilons if you are lucky, but that usually gouges the frame at the same time.