08-26-2012, 09:06 AM
Looking further at the photo makes me wonder, are the flats the full length of the bore? If they are do they have to be? If a smaller length of the "keyed" portion would work, say, 6-7mm it could be done with a file.
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.