No problem, undoing the screw does nothing at all? Just spins?
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!
@gillies started
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No problem, undoing the screw does nothing at all? Just spins?