Rotary # 8521 BUMP HEAD KNOB HOMELITE

The Rotary #8521 Bump Head Knob is a high-quality aftermarket replacement for the Homelite/Jacobsen A97910A. This red knob is designed specifically for EZ Line Advance Systems and is compatible with a wide range of straight-shaft trimmers from Homelite and John Deere.

Key Specifications

• Part Number: Rotary 8521 (also listed as 27-8521)
• OEM Cross-Reference: Replaces Homelite/Jacobsen A-97910-A, 308042003, and John Deere UP06764.
• Thread Type: 5/16"-18 Left-Hand Threads.
• Color: Red (Note: This is often used to replace the original green John Deere knobs).

Compatibility

This bump knob fits most Homelite straight-shaft machines, including:

• Homelite Models: ST-275, ST-285, ST-385, ST-485, HBC-30, GST-BC, and HLT28.
• John Deere Models: S1400 and BC1600.