229-20508 Arm Thread Guide A/B for Jack F4/F5/F6 Machine

229-20508 Arm Thread Guide A/B

This arm thread guide set routes the upper thread along the machine arm at two fixed points, maintaining steady tension before it reaches the needle.

Fits

• Jack F4, F5, F6 and JUKI single needle lockstitch machines

Why Replace It

Worn arm thread guides fray thread at the contact points, causing frequent breaks that seem unrelated to tension settings.

अक्सर पूछे जाने वाले प्रश्न

I’ve adjusted tension but thread still breaks — what else could it be?
Check the arm thread guides for grooves or rough edges — a worn guide can cause breaks that tension adjustment alone won’t fix.