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[Bluelight]

Hello,
 
I tested my Nikon RF 5cm lens and found it front focused according to distnace scale on the lens.
 
I bought it to a repair shop and the collimator reading a gap of 0.05mm and the repairman told me that I can add shim inside the lens.

[Rick_oleson]

Hi Ed:  Unscrew the slotted spanner ring in the back end, and the whole lens assembly will come out of the barrel.  A shim, if required, would go between the lens assembly and the barrel.  Here is a sketch of the LTM 50/1.4 - I had to cut it down to

[Bluelight]

Thanks Rick,
 
You always come to rescue....