These spindles vary in size and shape across the world, depending greatly on what type of fiber and yarn they were made to spin.
Hard Maple Weavers' Bobbin Winder - Fiber Artist Supply Co., LLC
Plant tour: Spirit AeroSystems, Wichita, KS
Setco Spindle Applications - Setco
Supported Spindles: Pairing Fiber & Tool Part 1
Tool Basics: Wraps Per Inch Tool
Filament Winder for Medium-Scale Production - Engineering
This Caucasus style support spindle and spindle bowl are handmade in the Republic of Georgia using the finest hardwoods. Available from The Woolery.
Kravelli Support Spindle Set
Drop Spindle
I am a Spinner: Kate Rogovin
Torque Reaction Arms for Industrial Applications
Essential Fiber Processing Tools Revolution Fibers — Revolution
I am a Spinner: Kate Rogovin
4 ways to get started on a support spindle & troubleshooting some