Foredom S.B0-516 Flexade 5/16Foredom S. B0 516 Use Product Options Menu to Select Coupling Size: S. B0 516 5 16 Coupling for use on current lathes built in 2002 and later with 5 16 motor shafts S. B0 14 1 4 Coupling for use on lathes older than 2002 with 1 4 motor shafts S. B0 12 1 2 Coupling S. B0 38 3 8 Coupling Current models of BL Lathes refers to models built in 2002 and later. These lathes have 5 16 motor shafts. Older models (including Nos. 1 5 High Speed Bench Grinders)