"Chris B" wrote in message
...
On 05/05/2020 20:59, AnthonyL wrote:
On Tue, 5 May 2020 20:26:31 +0100, newshound
wrote:

On 05/05/2020 20:13, AnthonyL wrote:
I hurriedly bought a pump some years back and have never been able to
use it.

https://www.flickr.com/photos/79018230@N05/49860238831

It has an external thread so I guess something is supposed to fasten
on to it.

I've put a standard Schrader/Presta adapter alongside for scale
purposes only. The pump has no internal thread(s).

I think you have bits missing. There should be a sort of "nut" that goes
on the external thread, except that it has an internal flange. There
should be a rubber component that fits inside the bit with the threads
on. This should have a hole about 6mm diameter that a normal "high
pressure" bike tyre valve fits into. When you tighten the "nut" it
compresses the rubber bush so that it grips the valve and provides a
seal.

Is there a name or do you have any link as I can't at the moment find
anything? Though probably not worth the effort. What's the advantage
of designing it that way?

I've always wondered why this sort of pump with no flexible hose from pump
to valve has become so popular. The ones with a flexible hose allow for a
bit of movement of the pump as you are operating it, without flexing the
valve stem on the wheel. The "tubeless" ones don't have that flexibility, so
as you work the pump you strain the valve stem unless you take great pains
to brace the pump against the spokes of the wheel - and that probably
doesn't do them any good.

I wish *all* bikes had Schrader (car tyre) valves. I know why a lot of
modern bikes have Presta instead, because those are narrower and can fit
through a smaller hole in the wheel, but Prestas are a PITA because you have
to loosen the screw to pump the tyre up and then remember to tighten it
afterwards, and a lot of air seems to leak out while the valve is in the
"delicate" inflation state. And you have to remember to carry a Schrader to
Presta adaptor (and not lose it at the bottom of a saddle bag) in order to
use a pump for car tyres - I mean a foot-pump, not one of the high-pressure
airlines at garages which say "not for bicycles". When I did a lot of
cycling I carried a car foot-pump in my saddle bag because it was a lot
quicker to pump up a tyre with a slow puncture than using a normal bike
hand-pump.