Wrong Quoin Key?

I picked up some used hi-speed Challenge Quoins and a key, which I thought fit the quoins.

The key seemed to fit at first, but I have no luck when turning it and actually expanding the quoin. I’m beginning to think this is the improper key?

image: Mystery Key

Mystery Key

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Great, thanks Paul. Looks like I’ll be ordering from NA.

Barplate also sells high speed quoins and keys
best james