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?


No but another poster has already spotted it. If this were mine I would
be checking whether this is a standard thread, for example it might well
be a BSP as used on plumbing fittings. So you might find that one of the
nuts off a compression fitting would fit, then I would see if I had a
bit of spongy rubber from which I could make the "washer" bit. I have
some foamed EVA about 12mm and 18mm thick that might do the job. Or you
could cast some "plumbing" silicone in the space, with a suitable bit of
stick where the valve should go. But you would have to decide how much
your time is worth. Another possibility might be to "glue in" one of the
flexible hoses to suit your bike valve. I'd probably use epoxy, but if
you can find a nut about the right size then hot melt glue could work as
well (relying on the nut to stop it being forced out by the gas pressure).