Internal O Ring Replacement for Nikonos IV-A

These are the dimensions of the o rings I installed in my Nikonos IV-A. 

I used NBR shore 60 o rings. 

First bath tube tests were positive but I am still seeking a professional pressure test.

I did not replace the frame number window o ring, because I haven't found a proper replacement yet. But, as it is a very static seal, it is unlikely to fail.



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Internal O Ring Replacement for Nikonos V

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 In this blog post, I will show you, how I replaced the o rings of my Nikonos V. Besides replacing the internal o rings, I'll also provide the dimensions of the user-replaceable o rings. First, remove the batteries Four screws secure the cover of the electronics Use some flat tool to hold against the screws, when unscrewing the LED exposure indicator cable One screw in the film chamber … … and two screws … … at the take-up spool secure the inner part. Remove the retainer clamp with a spudger or your fingernails The removed retainer clamp A reminder, of how to reassemble. We find our first o ring here under the ISO dial. I call the position ISO dial bottom There is another clamp on top of the ISO dial, underneath the winder. You can actually take it out more easily later after the rewind crank has been removed from the ISO dial. There is a small hollow bar/pipe on the bottom of the rewind crank. You can pull it out using pliers. I didn't have smaller ones handy, but would recomm...
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