Boris,
I think 14mm is a problem.  The extension rings have some pretty standard sizes.
13-21-31mm is a set I find on ebay. 12-19-26mm is the Pentax Auto
system (Thanks Boz)
The Helicoil tube starts at 26mm so that's out.
The Bellows won't go that short either.
Find some off brand, adapt a screwmount set of tubes, or have something made.
If you were willing to give up the aperture lever actuation, I think
you could do it easily...
Regards, Bob S.

On Nov 10, 2007 6:45 AM, Boris Liberman <[EMAIL PROTECTED]> wrote:
> No, that's the point. I am missing the proper focus range. Currently, I
> don't have an infinity focus...
>
> Boris
>
> Bob Sullivan wrote:
> > Boris,
> > I suppose you can't get 2mm of distance out of the lenses focus mechanism...
> > Regards, Bob S.
> >
> > On Nov 10, 2007 2:53 AM, Boris Liberman <[EMAIL PROTECTED]> wrote:
> >> Hi!
> >>
> >> I have an extension ring of 12mm. But I need 14mm worth of extension.
> >> Does any one have an idea how I can achieve this? Anyone having a 14mm
> >> extension ring they would be willing to part with? Exchange it for 12mm 
> >> one?
> >>
> >> Please refrain from the jokes of the very specific nature.
> >>
> >> Thank you.
> >>
> >> Boris
> >>
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