G'day Gerry (... Joe ..., sundry other singers &/or folklorists) ...
I think the turning of this tale has clearly shown that there is a whole compass card of different directions in which his song has gone over a few decades (- compared to the body of folk song).
I raised my differences from the initial DT version because it seemed to me that many of the changes in the DT version came from either lack of familiarity with the regional accent ... or vernacular vocabulary ... of Colin Dryden ... but, as Gerry's posting shows, many more versions pivot arrange deeper levels of the interpretation of original intent - and the perceptions of communicating to one's presumed, present & local audience.
There is ... clearly ... no such thing as "THE CORRECT VERSION". Perhaps all I can say about the word choices / grammar / chorus frequency - placement / choice of terms / phrases that might be appropriate to working in a factory environment as I have used in my initial posting is that they are ... to me ... true to my recollection of Colin's performance / my experience of working in analogous envirements over my formative years / my personal ( ... or perceived ... ) feeling for when it is or isn't appropriate to sing the chorus - whatever the chorus brigade in front of me reckons!
All I can really say for my original posted version is:
"Transcribed from Bob Bolton's mid 1970s to early 2013 recollections of early 1970s Sydney performances by Colin Dryden ... " and admit that this allows for the possibility that this doesn't definitively derive from how Colin sang HIS song before ... or after that ...time or to different audiences - let alone how other singers of different singing (or working) experience / nationality / ethos / accent or vocabulary / audience perceptions have perceived / recalled / reworked it."
It certainly sounds ... to me ... like the "right way" to sing it - but ...