g'day mike.
Remove the Clamp bolts that hold the pedals to the shaft using a small steel wedge or a suitable screwdriver drive it in the gap gently just enough to loosen the pedal ,pull the pedal of the shaft,remove the woodruff drive key and slide the shaft out you will find that the shaft is worn, it can be welded up and either ground or filed back into shape, the bushes are available from your M.F dealer gently tap the old bushes In using a suitable pin punch ,clean the holes out making sure they are free of marks or anything that could damage the new bush when you install ,the old bits of bush can be removed by taking the plate of the bottom of the clutch housing.
happy days.
Hutch.