Hey Marksman...
Ali tube only because everything i see & read says aluminium pillars etc.
As you say its just to stop crushing...
I actually got hold of an original brno pin/tube but think ill put a tube in incase i bodge it...
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I dont want to cut up my tyre inflator for the project...cos mine works
So i guess using steel makes sense now you mention it...as you say can do it up tighty tight.
The original is about 9.2mm OD, 1.1mm thick
The Aluminium tube i was gonna buy is 10mm OD with 1.6mm wall so as i said above there is more clearance for the screw than original...& i figured drilling out the stock a further .4mmin radius wont compromise it any...
Guess ill fire up google now & see if i can find some steel tube in same dimensions...
The man who knows everything, doesnt really know everything...he's just stopped learning...