Originally Posted by
DRietz
Well, PX10's were made with butted tubes, right? So maybe it's just a piece of metal that could be dropped in at the top and then smashed down into the butted section of the tube?
I'm also just making this up, so..... yeah....
Remember, butted tubing means it's thicker at the ends and not the middle, so you cannot just drop items down the tube and expect it to stop and jamb against a section in the middle. The thinner wall section at the middle will just let it drop down towards the BB shell or lower butted section, much lower than the few inches down the OP noted on his PX10. My 80's Peugeot PSV does not have this plug in it. I figure that they used to do it back then for some obscure "French" bike building design logic/purpose.........which is not surprising these days when looking back at older French bike frame
construction and component design.
Chombi
84 Peugeot PSV
85(?) Vitus Plus Carbone 7