Rotary vs. Shuttle Hook Sewing Machines - Jacksew

A rotary hook and a shuttle hook are two different types of hook systems used in sewing machines.

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Rotary & Oscillating Sewing Machine Hook - The Quilting Room

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What to Look for in a Vintage Sewing Machine Part 2 — Ashley and

Rotary Hook vs Oscillating Hook Sewing Machine Systems - JYL

Zig-Zag Walking Foot Sewing Machines