I decided I’d get a track pump for my bicycle. I went down to Halfords and they had 3 types, with no indication of the prices. I thought the BikeHut one was the cheapest, so I took it to the checkout and it turned out to be £38. Then when I was out of the shop I found the head was missing! So I took it back and changed it.
So then I found it wouldn’t work with my Presta valves (there were no useful instructions with it). Eventually I found some discussion here with the final answer
Thanks for all the replies guys,
I think I have figured it out now. I simply wasn’t pushing the valve
into the connector hard enough. The ‘schrader push pin’ is spring
loaded and pushes back quite a way. Initially, when you push the
connector on, there is quite a rush of air from the tire (this is
point to which I was getting before). However, if you push harder
then the valve enters the connector further (by pushing against the
spring loaded pin) and reaches an area where the rubber grip smothers
the airflow enough that you can tighten the lever. So the trick is to
push it on firmly and quickly.
I find this works well now on my back tire and makes an airtight seal.
On my front tire (which has a different make of inner tube) I find
that even with the lever tightened fully, I still get a bit of air
leakage, but it’s not enough to bother me.
Brian, do you fully unscrew the presta nut at 1?
So I tried that, and it worked on the front tyre and well enough on the rear one, though the join was rather leaky.