Product Description
Shimano 10MWD Thumb Bar (BNT4643) | Quick-Fire II Clutch Bar
The Shimano 10MWD Thumb Bar (BNT4643) is an essential external component officially known as the Quick-Fire II Clutch Bar. It is the primary interface for the reel's casting mechanism, designed to disengage the spool and allow for one-handed casting.
As a high-touch point, this thumb bar is engineered with a textured, ergonomic surface for maximum grip and comfort during repetitive casting. It is a common replacement part for high-end baitcasters because it can become worn, sticky, or cracked over time due to constant mechanical pressure and exposure to skin oils and the elements.
Product Specifications
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Part Name: Quick-Fire II Clutch Bar / Thumb Bar
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Shimano Part Number: 10MWD
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Alternate Part Number: BNT4643
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Material: High-Impact Textured Polymer / Composite
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Mechanism: Clutch Release / Free Spool Engagement
Compatible Reel Models
The 10MWD (BNT4643) is a precision-fit component for several of Shimano’s flagship low-profile baitcasting series. It is a direct replacement for:
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Shimano Chronarch CI4+: 150, 150HG, 151, 151HG.
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Shimano Chronarch MGL: 150, 150HG, 150XG (and left-hand models).
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Shimano Metanium MGL: 150, 150HGR, 150XGR.
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Shimano Metanium DC: HGR, XGR versions.
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Shimano Metanium '13: Standard and HG models.
Installation Note: Replacing the thumb bar typically requires removing the side plate and the spool. It is held in place by the Clutch Bar Guide and secured with a small screw. To see the exact screw locations for your model, consult the official PDF schematics at www.reelschematic.com.
Maintenance & Lubrication Recommendation
Since the thumb bar slides along internal guide rails (clutch bar guides), friction can build up, leading to a "sticky" feel or failure to pop back up after turning the handle. We recommend Deuthlon Lubricants:
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For the Guide Rails: Apply a very thin film of Deuthlon Reel Gear Grease to the internal tracks where the clutch bar slides. This high-tack grease provides a smooth, "damped" feel and prevents the polymer-on-polymer wear that causes shifting issues.
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For the Pivot Points: A drop of Deuthlon Power Cast Oil on the small pins or screws that secure the bar will ensure the return spring can reset the bar instantly when the gears engage.
Why Choose Genuine Shimano 10MWD?
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Ergonomic Precision: Maintains the factory height and angle, ensuring your thumb naturally finds the bar for rapid-fire casting.
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Texture Integrity: The original BNT4643 features a specialized non-slip texture that won't become "mushy" when exposed to sunscreens or fish scents.
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System Timing: Correct tolerances ensure the bar pushes the Clutch Plate (BNT4642) far enough to fully disengage the pinion gear, preventing "gear grind" during a cast.
