Try some more research on the bars and stems for track bikes.
I recall reading that, in the late 1940s, there was suspicion as to the strength of the aluminium/hiduminium, as it was relatively new and untested. Steel components may have been favoured by the track riders due to their known strength.
Many early bars had a steel ferrule for that reason. (like my GB 'Maes" bars)
(heads off to look through old magazines)
Philip
[edit] GB released the Hiduminium stem in mid-1948 (The Bicycle 16 June 1948 p8)
Try some more research on the bars and stems for track bikes.
I recall reading that, in the late 1940s, there was suspicion as to the strength of the aluminium/hiduminium, as it was relatively new and untested. Steel components may have been favoured by the track riders due to their known strength.
Many early bars had a steel ferrule for that reason. (like my GB 'Maes" bars)
(heads off to look through old magazines)
Philip
[edit] GB released the Hiduminium stem in mid-1948 (The Bicycle 16 June 1948 p8)