In reply to Richard Horn:
As always, the answer is here is profile. Be the nicest, most mild-mannered person on the planet, but if you're getting nowhere ask to see their supervisor, again as Mr Reasonable.
The wording is clear under "Dangerous sports equipment"
"If you’re travelling with any of these items, you’ll need to contact Eurodespatch, our registered luggage service: ice axes and other climbing and mountaineering equipment, javelins, spears and spear guns, crossbows, crossbow bolts, longbows, longbow arrows and starting pistols, swords or starting pistols. Keep in mind that these are all subject to approval and security checks."
In no way is a krab sharp, pointed or capable of firing a projectile or inherently dangerous, with 'dangerous' being the operative word. It has nothing in common with the other articles listed. It bears a passing resemblance to a knuckle duster - but those are a) illegal and b) referred to only in a pictogram. It also bears no resemblance to DIY tools, hammers etc. The more climbing clatch you have, the weaker the argument that it is 'intended' as a weapon. If you want the latter, a laptop battery is a fine device, or a good 'ole boys belt buckle.
I'd pack them well, at the bottom of your luggage.
I've never understood what makes the Eurostar so vulnerable compared to any other non-stop service. So what if it's in a tunnel for some of the time. You spend longer in a tunnel on the Tube to get to the wretched thing