My lathe uses a smooth shaft 5/8 inch in diameter. There is a flat spot ground into the shaft for attaching fixtures with a setscrew. Blade mandrels are available from various hardware concerns. This one slides onto my shaft and is secured with a setscrew. It has a 5/8 inch diameter threaded end with spacers, a washer, and a nut. Check your lathe. Some lathes use a hollow shaft with a Morse taper. You may need to get a special mandrel direct from the maker of your lathe.