G'day folks,
Finally found this old thread, which shows re-machining of Greenfield drive pulley clutch surfaces, using a gap bed lathe.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=43216The pics there are still on Photobucket though, and these days need a web browser add-on to make them viewable.