Quite poorly, but it will: soldering is not welding, just a warm "metal glue" of sorts.fancypiper wrote:AFAIK, aluminum won't solder.
But you're generally right. It won't solder with a reliable bond. And certainly not will bakelite (if thinking of Burke)... but both will find adequate modern cold glues.
Funny thing is most Quenas have a bore restriction, just at the end.
So do some Albas, with a less pronounced restriction.
You can call it a perturbation.
All it gets to, when you think of the "limit layer" effects of an airstream, is kind of creating a "virtual cone" for laminar flows in the bore.
As far as I can judge from Albas and quenas, having no experience with Burkes nor Reyburns, is that it works...
Also, Overtons (and all older square head/round tube whistles like the all-metal pre-plastic Generations) and recent Chieftains, as well as Albas, have a perturbation of sorts, but up there, next to the blade.
Now, to give back to Cæsar... Michael Burke was the first (to my limited knowledge) to call his alterations of the cylinder "Perturbations". He should have registered such a nicely coined--and ain't it perturbating?--definition.
Also, he seems alone to fit a restricting shim in the middle of the tube, not only down under or high up.