Vintage Peugeot conversion help and tips please

edscoble can you tell me what wheel are you using ?
my axle spacing is 126 mm and the local bike shop made a big fuzz about using a track flip flop hub because the spacing has to be 126mm.
I read on S, brown that the fram can be narrowed and is not rocket science, but i do believe that honestly 3mm on each side can be easily gained tightening the axle nuts, NO ?
thanks

Easy- just tighten it down. My bike is 126mm rear spacing, running on a 120mm track hub and it's fine. You don't really even need to cold-set the frame (what Sheldon Brown mentions) as steel can take it fine.