If it helps, I've seen these go for about £50 for a half meter pair on the used market.
Also seen them go for more, what you need is someone who's looking for a second pair
I think I’ll keep the Russ Andrews ones then .
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These are the van den hul ones which I thought were pretty good , I’ve now swapped them with the crystal ones .
I will list these for sale shortly but before I do are the plugs on these anything special?
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No mate, there are some similar plugs on eBay. Probably not the same quality but nope, nothing to get rich from.