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@Dutch_Cheese
Yes, AA -Special has a solid tube soldered through the t/t.
Maybe it's stuck.
Try to open it with a metal rod, e.g spoke or, even better. welding rod.
I remembert that these tubes were blocked sometimes after shot blasting. Gazelle used to try to unblock with a welding/brazing rod fitted into a drillng machine and "drilling"/ pushing it though.
Maybe some WD40 will do the job as well.