My "Go-To" source for esoteric bike info is Sheldon Brown
if you are not familiar with his site....here you go!
Sounds like you have a handle on it but he has good tricks and sources.
Especially good with older bikes and bike construction "history" for us old guys
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In response to this post by EDGEMAN)
Link: Loves me some Sheldon...
Posted: 07/28/2017 at 8:39PM