[SchlockRod]

I acquired one of these... a pretty cool vintage clarinet item. Clarinet being only an occasional double, the ability to tune on the fly is a nice thing to have.
It was frozen up when I got it, so a judicious application of penetrating lubricant, some heat to the metal bore with my soldering iron, and some soft grip pliers seemed to do the trick. In the second photo (bottom of the barrel, haha!) you can see the inner bore and the female-threaded (or so I thunk) outer metal sleeve which is bonded to the hard rubber body. These are now spinning freely with respect to each other, but...
The length of the barrel doesn't change! Nor can I pull on the barrel lengthwise to get it to extend. I was pretty sure these are threaded, like a Conn microtuner. No?
Any advice and/or insight as to how to make this work is most appreciated.

 

[SchlockRod]

Here is the top socket on the barrel. The knurled ring, the socket bore, its base, and the barrel bore are integral and all turning together, which is as it should be, I'm sure. But they just spin inside that outer metal sleeve visible from the bottom.

 

[SchlockRod]

What gives? It appears (disappears?) that my photos have disappeared from the post.
Aside from that, I'd really like to hear from someone who knows about these adjustable barrels.

 

[SchlockRod]

What gives? It appears (disappears?) that my photos have disappeared from the post.
Aside from that, I'd really like to hear from someone who knows about these adjustable barrels.

Disregard about the photos... Operator Error... I failed to hover over the "attachment" text...