I may be wrong but it looks like a self-extracting crank bolt. Remove the crank with an Allen key
Yep. That it was! The WD40 helped massively, but jesus it was so stiff I had to step on the hex key and use my body weight just to get the initial turn. Thanks all.
@yoav started
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I may be wrong but it looks like a self-extracting crank bolt. Remove the crank with an Allen key