Product Description
Penn 1188666 Worm Shaft Assembly (42-15)
The Penn 1188666 Worm Shaft Assembly is a genuine factory replacement part essential for the proper function of the level-wind system in specific Penn conventional reels. This component is responsible for guiding the line back and forth across the spool during retrieve, ensuring an even and uniform line lay. A properly functioning worm shaft is critical for preventing line bunching, minimizing backlashes, and ensuring smooth casting and retrieving performance.
This assembly is a complete unit that typically includes the worm shaft itself and may come with associated components required for a full replacement. It is manufactured to Penn's precise specifications and tolerances to guarantee a perfect fit and restore the reel's original performance. If your reel's line guide is no longer traversing the spool or is moving erratically, a worn or damaged worm shaft assembly is often the cause.
Key Features:
- Genuine Penn Replacement Part: Ensures compatibility and restores original factory performance.
- Controls Line Lay: Drives the line guide (pawl) back and forth across the spool.
- Prevents Line Management Issues: Crucial for avoiding line stacking, digging-in, and casting problems.
- Durable Construction: Made from high-quality materials to withstand the mechanical stress of operation.
Applicable Models:
This worm shaft assembly is designed for the Penn Fathom 15 (FTH15) conventional reel. It is specific to this model size.
- Penn Fathom 15 (FTH15)
Important Note: It is crucial to verify the model number of your reel before ordering parts. This part is not intended for other Fathom sizes (e.g., FTH20, FTH25, FTH40, FTH60) or different Penn reel series.
Substitute Part Numbers:
- 42-15: This is the older part number for the same worm shaft assembly. Penn updated its part numbering system, and 1188666 is the current number for the part previously known as 42-15. If your reel schematic lists 42-15, this is the correct replacement part.

