Personally I think the possibility of V-C making tubes is Horse biscuits. Show me the ledger where they sourced steel bars 4" in diameter & say 15 - 18" long from specific steel makers? They probably didn't have any more tools that a handful of bastard files. I'll bet my hat that they made zero(0) Jno. Hy. Andrew Toledo Steel tubes. I have a difficult time believing anything a maker says about itself without some external inputs to confirm. For some reason the Andrew's Toledo Steel tubesets were revered. I doubt anyone less a master mechanic could have sourced them.

Kind Regards,

Raimey
rse