Missing part of radiator

Hi, I’ve had to remove a hive thermostat on a radiator in my home and want to replace it with a normal knob. However no knob fits. It’s there is no where for the knob to screw in…. If that makes sense. It’s like there is a piece missing. Can you tell me what part I need to get so that I can attach the knob please.
Do have pictures which I’m not sure how to show, but any advice would be great.

Advice from 1 local tradesperson

You can replace the valve for cheap , there may not be a part that will fit as sometimes they come as one hole part from the manufacturer

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