New lathe drive spur fits all models of Shopsmith.
Fits the 5/8" smooth shaft with set screw.  Allan wrench is included.
These  are not a Shopsmith product but they do fit perfectly.
If you have any questions please contact me.

This item is made to fit a Shopsmith with a 5/8" smooth, un-treaded shaft.  I get a lot of questions on what is the inside thread.  There is no internal thread.  It's a smooth bore.

This item is not able to be threaded.  Please do not purchase this and try to thread it.  I will not accept the return once it's damaged from attempted threading.