Here is a scan from typical uses of push and pull symbols (the very first symbol is "pull" in every piece). The symbols usually appear _before_ the fingering, at somewhat constant height independent from the actual notes.
They are used somewhat in analog with upbow/downbow symbols for bowed string instruments. Because of the longer breath of the accordion, they can be used above measure bars as well to indicate playing a whole (or more) measures on one breath. In contrast to upbow/downbow, they tend to appear slightly before the notes (even if there are no fingerings). Part of the reason may be that they need to be discernible even when having (and playing) both bass and treble staff. The bounty is 25€ for creating symbols nicely integrating with the normal Lilypond fonts (and not confusable with other accents or marks), and 65€ for creating the magic needed for placing them well in connection with other articulations/fingerings just when given simple \push \pull style commands. There is another 10€ bounty to integrate them with bars so that one can have whole pushbars and pullbars. That's not oodles of money, but it is in areas I would prefer avoiding having to invest the time for getting acquainted with them.
<<attachment: pushpull.png>>
-- David Kastrup
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