Rolex cal 700 10.5 Hunter balance staff- information needed

[RobR]

I'm hoping someone can help clarify the size differences in the Rolex balance staffs for the cal 700 10.5 Hunter.
I have been unsuccessfully searching for a Ronda 2165 staff which is the correct staff for the movement I have.
I have found online two suppliers with NOS Rolex staffs with Rolex part designations 3854 and 3855. I don't have access to the Rolex part catalogues. I am assuming the #3854 is equivalent to the Ronda 2165 but we all know what happens when you assume.

Can anyone please help with the dimensions A, G and J below of the 3854 and 3855 and also the pivot diameters?

Thanks
Rob

 

[Chris Radek]

 

[Bila]

Staffs to suit that caliber should be the following in regards to A, J, & G;

A= 3.19mm
G= 0.38mm
J= 0.85mm

Non-Shock

A=3.22mm
G=0.40mm
J=0.85mm

Shock

 

[RobR]

Thank you for quick responses, the info is just what I needed
Rob