Redfield 6400 Turrets

[cbnky]

I very recently traded for a Redfield 6400 and need information on how to set the turrets to zero for a specific distance. It seems it should be be intuitive as there is only the one center cap screw, but my intuition sometimes get me into trouble. Moreover, I can't seem to find a full manual anywhere online. Any help/advice on this matter is greatly appreciated. Thanks and best regards.
cb

 

[slobhunter2]

Maybe this will help

 

[slobhunter2]

This is all I have ever seen as far as paper work, but yes pull screw, remove cap, and reset

 

[cbnky]

Thanks for your response. I did locate the Redfield attachment you posted, but it seems there should be another page. Moreover, your response as to how to set the zero is what I was thinking, but I was reluctant to start pulling and tugging on the turrets without confirmation. I will give it a go. Thanks again.
cb