Hurricane, Headstock Spindle Adapter, Converts 1" x 8 TPI to 3/4" x 16 TPI - The Woodturning Store
4-Inch 4-Jaw Self-Centering Chuck Set Adapter 1" 8TPI To M33 X 3.5 For Wood Lathe Chuck Converts Turning Tools Lathe Headstock Spindle Adapter with 1-Inch x 8TPI Thread : Amazon.co.uk: Business, Industry
Lathe Headstock Spindle Reducing Adapter with Thru Hole for Vacuum Chuck - Converts 1-1/4"-8 TPI to 1"-8 TPI - Harrison Specialties LLC
findmall Lathe Headstock Spindle Adapter Converts 3/4 Inch x 10 TPI – FINDMALLPARTS