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Biggles567-
This is a mix of mild steel (steerer clamp and extension) and 4130 cromo (handlebar clamp).
I have some 4130 in the steerer clamp/extension size but wanted to try one with the cheaper material first.
I didn't quite get the ID right for the steerer clamp actually, both the mild steel and 4130 needed boring out a bit.
M_V
I finished up on my own version of the gas pipe stem today,