Dillon 550 toolhead hole size?

[shovel66]

I am away from my press and equipment for another 10 days or so. I'm making a toolhead stand for my 550. Can anyone measure the diameter of the center (non-threaded) hole of the 550 toolhead? I believe it to be just over 1/2" but want to get a little more precise measurement. Thanks in advance.

 

[Alland]

I measured one at .562" or .563". That makes it 9/16".

 

[shovel66]

Thank you, Alland, for going out of your way to measure this. I appreciate your quick response.
Am making a better way to organize and store my toolheads.

 

[Alland]

Anytime that I can help, which isn't all that often.