Product Description

Here is the detailed product description for the Shimano 1097D Clutch Bar Guide B (BNT4579).

SHIMANO 1097D CLUTCH BAR GUIDE B (BNT4579)

Smooth Vertical Guidance for Your Thumb Bar

The Shimano 1097D Clutch Bar Guide B (Part No. BNT4579) is a specialized structural component designed for the modern "D" generation of Calcutta round reels. This guide is a high-precision plastic track that mounts to the interior of the frame to provide a smooth, frictionless path for the Quick-Fire II Clutch Bar (thumb bar).

In the Calcutta 301D and 401D, the clutch bar is supported on both sides. Guide B is specifically designed for the Left-Hand (LH) drive architecture. Because this part is made of high-quality composite, it can eventually wear down after thousands of casts, or become brittle and crack if the reel is subjected to heavy impact. Replacing a worn guide restores the "like-new" crispness of the thumb bar and prevents it from sticking in the downward position.

Product Specifications

• Part Name: Clutch Bar Guide B

• Manufacturer: Shimano

• Part Number (MPN): BNT4579

• Schematic Code: 1097D

• Material: High-Density Engineering Plastic (Black)

• Orientation: Left Hand Only (Specifically for LH models)

• Installation Position: Interior Frame (Guides the movement of the Thumb Bar)

Compatible Models

This part is unique to the "S-Compact" body design of the Calcutta D series in its larger, left-handed sizes.

• Shimano Calcutta D (Left Hand):

  • CT 301 D (Calcutta 301D)

  • CT 401 D (Calcutta 401D)

Note: Right-Hand models (300D/400D) utilize a mirrored version of this part with a different part number. This specific 1097D/BNT4579 guide is strictly for the 301/401 LH chassis.

Installation & Reference

To ensure this is the correct guide for your reel, please cross-reference the part number BNT4579 or the schematic code 1097D with your reel's service diagram.

• Schematic Diagrams: For detailed PDF schematics and part location verification, please visit www.reelschematic.com.

• Alternate Part Number: BNT4579

Installation Tip:

1. Cleaning the Track: Before installing the new guide, ensure the frame's mounting surface is completely free of old, hardened grease and grit. A clean mounting surface prevents the guide from sitting "canted," which would cause the thumb bar to bind.

2. Lubrication: Do not use heavy gear grease on this part. A light coating of Shimano Permalub or a PTFE-based grease is ideal. It provides lubrication while resisting the buildup of "sludge" that can slow down the clutch return.

3. Paired Replacement: On many D-series reels, there is also a Clutch Bar Guide A. If Guide B is showing wear, it is often best to replace both simultaneously to ensure the thumb bar travels perfectly level.