Turned out that most tool shops don't actually know at all what is that threaded nipple they are selling. Lucily few pagages have markings (which some tool shop workers don't seem to know). Pretty amazing really.
Anyway, R 1/4" turned out to be the perfect fit and it (and some others tools) have been sorted now.
I asked around and funny thing is that most of the people seemed to resort buying a G 1/4" tap and then it all is standard Parker fittings and sealing glue. Seem to work. Brute force approach I think.
Maybe I should buy a little box of fittings and standard hose. And buy fittings as I use them to keep minimal amount of cash invested, after all pneuamtic fittings are not my hobby and I don't have any such shop nearby.
I don't know if this form of fitting good or safe, but it has worked for me on barbed hose fittings: I measure outside of the hose and make thick wall aluminium bushing that has ID just a tad bigger than the hose. Both inside ends of this bushing are camfered. Then I slip the bushing over the hose, some distance down (usually 150 mm or so), fit the barbed fitting and force the bushing over the fitting. They seem to hold well, I haven't had any trouble with them. I have noticed that some barb fittings have more barbs or higher tops, but they have worked fine so far.
I have been thinking of adding ashessive shrink tube on top of the whole, but haven't found flexible material. Normal electrical one seem to crack after a year or so.
I prefer the bushing over jubilee clips. I really hate them on power tools. They scratch me or something else.
Pekka