Alpha one Gen 2 - Steering Pinion - Thread diameter

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Hi all,
We are attempting to remove steering pin on our Alpha One Gen2, there is a threaded slot to assist with pulling out.

Does anyone know the measurements of this slot?

It's the threaded slot on the left side of this pic.

Thanks all.

https://imgur.com/Yq34IPj

 

[ChromeDome]

Is this helpful?

 

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Thanks - I spotted that video alright, but didn't give specific info. I will pick up a few different sized imperial bolts and work on trial and error...