The song you are looking for is called: ONE OF THE HAS-BEENS. It's an Australian shearing song, and is from the point of view of an old man who used to be the best shearer in the sheds, i.e. the ringer, but now he is old and has lost most of his shearing prowess.
The tune is PRETTY POLLY PERKINS OF PADDINGTON GREEN, and this tune and lyrics are in the DT database, if you search for [Polly Perkins].
I probably found this on an Australian folk music site. I posted these lyrics in a thread called "Feedback please" a while back. I'll check where I got it from and post the site address.
ONE OF THE HAS-BEENS
I'm one of the has beens a shearer I mean
I once was a ringer and I used to shear clean
I could make the wool roll off like the soil from the plough
But you may not believe me for I cant do it now
CHORUS: I'm as awkward as a new chum and I'm used to the frown
That the boss often shows me saying keep them blades down
I've shore with Pat Hogan, Bill Bright and Jack Gunn
Tommy Leighton Charlie Fergus and the great roaring Dunn
They brought from the Lachlan the best they could find
But not one among them could leave me behind
It's no use complaining I'll never say die
Though the days of fast shearing for me have gone by
I'll take the world easy shear slowly and clean
And I merely have told you just what I have been
Printed in Stewart and Keesing Old Bush Songs with the note: "From Mrs G.L.Ginns, of Merrylands, NSW". (Written by Robert Stewart) From the singing of A.L.Lloyd, who writes on the notes for Across the Western Plains that he heard it in Cowra, NSW when he was working there in the 1920's. Tune 'Pretty Polly Perkins'