Collapsible spare: valve stem fell off

[Deschodt]

I just noticed the valve stem separated from the wheel, lying there in the trunk, making the collapsible spare useless. The valve stem is threaded, and I can hear presumably the female threaded part rattling inside the tire...

Can a semi competent tire place actually dismount the tire and reassemble the stem? Just asking because the tire - when collapsed - sits pretty far inside the rim, more than a normal tire, and it might be a PITA to remove/reinstall requiring a specialist or different tools????
The search yielded only one relevant post by Steve Wilkison " the factory manual says--"service by factory only.""

Why the special stem anyway? It's like a double stem, very odd...wouldn't a regular valve stem work ?

[ossiblue]

I believe the double stem is to allow rapid and complete deflation as well as inflation. A standard valve would work, but you'd have to remove the core to allow for deflation. Some inflatable spares have two separate stems in different locations. Don't know about removal, but these spares have been around quite a while so I'd bet a good tire store could remove and mount the tire and repair the stem. If not, you could probably pick up one fairly easily from a wrecking yard.

[Jerome74911S]

My collapsable spare has a conventional rubber stem that was installed by a PO. It works, but is not as convenient to deflate.

[rootmatt]

My valve came loose a while back. The local (Porsche-friendly) tyre guys demounted the tyre and tightened the valve. Can't say it was quick nor that the guys had a good time. Still, they got it done.