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My russian four-spoke and pair of discs are all flat for the same reason. Tried and failed with a 90 degree. Interested to see what the adapter @Pifko is buying will be like.
The hole in my -insert obscure unknown Russian- disc is too small to get the normal pump head in and I had to get a screw-on 90 degree adapter for the valve. Problem is the pressure just makes the pump head blow off the adapter. It's a bit rubbish.