Hi,
I have a Zefal competition vintage pump and i would like to use it and mount it on my PX10. My tubulars has presta valves but the pump won't pump the tyres up and just leaks air at the valve. I think the problem is that the rubber bit that pushes onto the valve has enlarged and doesn't seat snug around the vavle and thats why it isn't working. But i'm not sure and wonder if its anything else. I have attached a photo of the end with the bits removed from the pump in case anyone can see if anything is missing.
Originally the pump wasn't working but i replaced the rubber peice inside the pump and now it has good pressure.
Here is the photo and thanks in advance.