Cylinder head center bolt access tricks wanted

i am sure some of the members here with racing cylinder heads with large diameter valve springs have run into this problem. How do you tighten or loosen the center head bolt that is in between the two exhaust valve springs. I have always had to remove one spring with the engine still on the motor to get a socket on that bolt or in my case the stud nut.
Does anyone have a trick or special tool they can share with me to get at that bolt without having to remove a valve spring?

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