-----
the inverted MAEDA housing stop may be a replacement for a broken braze-on
a Gripfast seat binder would be plausible
you are going to be applying heat to excise w/b so you could add inflator pegs at the same time...
suspect frame may be three-tube 531 plain gauge - does this line up with your knowledge of the range at this epoch?
in the event you elect to fit a propstand it should of course be a Shuresta -
advert of MCMLXII:
advisory: member non-fixie is "Cuckoo for Cocoa Puffs" when it comes to these Sakae Ringyo Apex chainsets with the 86mm BCD. don't let him read the thread or he may fly over from NL to raid your premises...
-----