Brand new Lathe Spindle Adapter to fit 5/8" plain Shopsmith spindle to 1" x 8 TPI threaded chucks and other lathe accessories. This spindle adapter is bored 5/8" for the plain Shopsmith spindle and has a locking set screw. The other end is threaded 1-8 (1" diameter x 8 threads per inch) for lathe chucks and accessories. Drilling Buffing Polishing Shaping on a Shop-smith Wood working lathe Safety Note: It is very important that you securely fasten the spindle adapter to your lathe spindle, and any of your 1-8 threaded accessories to the spindle adapter. Failure to properly secure these components can result in injury.