Help removing a spoke

Hi – I snapped a spoke last week and I’m currently trying to remove another in order to measure the exact length for the replacement. Problem is that the round spoke is turning as I turn the spoke key. I am sure that there is a way around this – but how?
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Although if you turn it far enough it has to stop turning or snap.
There is no secret ingredient - Kung Fu Panda
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Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
If you are clamping the spoke tightly enough - just above the nipple - it won't turn. Try heating the nipple with a hair dryer to weaken the thread lock and use mole grips to grip the spoke.