SM Oscillating Rockshaft Free Size

Description

This sewing machine oscillating-rockshaft helps control things like:

• The rockshaft oscillates (rocks back and forth).
• Needle bar movement (vertical up/down)
• Feed dog motion (moving fabric under the needle)
• Hook timing (in machines with oscillating hook systems)

It plays a key role in syncing these actions so the machine can form stitches properly.