Yep. I'm pretty sure the allan key engages with the head, but it doesn't tighten or loosen off.
Can you somehow hold the topcap still whilst using an Allen key to tighten/loosen the expander? Something similar happened with mine and it took what I can only describe as 'serious fettling' to get it out. All was fine in the end!
Is that how you fixed yours? Did you replace the the expander? What with?
@TooTallTim started
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Yep. I'm pretty sure the allan key engages with the head, but it doesn't tighten or loosen off.