Should start and stop and start again ad infinitem . Probably cause is a weak spring , looks like a "w" . By the way ,there is no flyback function . There is an incomplete manual on this web site , cal. 11 12 14 15 7740 7741 have the same chrono module parts .

: Gentlemen, I have a Bulova chronograph which
: has a
: cal. 15 movement with a micro rotor.
: I just had a watchmaker overhaul the movement.
: After picking it up I noticed that the start
: button does not resume the counter after
: stopping and the chronograph has to be reset
: to zero...
: My watchmaker claims that this is the way this
: movement functions but I seriously doubt it.
: Can any of you please shed some light on this?
: Where can I find a detailed schematics of this
: movement so the watchmaker can refer to it?
: Thanks in advance, afinewatch.