1. Introduction
This manual provides instructions for the proper installation, use, and maintenance of the uxcell M12 x 1.25mm Thread Blue Car Manual Gear Lever Shift Knob Boot Retainer Adapter. This component is designed to secure the shift boot and fill the gap between the shift boot and the shift knob, providing a clean and finished appearance.
2. Setup and Installation
Before beginning installation, ensure your vehicle's gear shift knob has an M12 x 1.25mm thread size for compatibility. Incorrect thread size will prevent proper installation.
- Prepare the Shift Area: Ensure the area around your existing shift knob and boot is clean and free of debris.
- Remove Existing Shift Knob (if applicable): If you are replacing an existing retainer or installing with a new shift knob, remove the current shift knob by unscrewing it counter-clockwise.
- Position the Shift Boot: Ensure the shift boot is correctly positioned around the shift lever.
- Install the Retainer: Thread the uxcell Gear Shift Knob Retainer onto the shift lever in a clockwise direction. Ensure it seats properly against the shift boot, closing any exposed gaps. Do not overtighten.
- Install Shift Knob: Thread your shift knob onto the shift lever, over the retainer, in a clockwise direction until it is secure.

Figure 1: Top view of the uxcell Gear Shift Knob Boot Retainer Adapter, showing the internal threading and overall blue finish.

Figure 2: Angled view of the uxcell Gear Shift Knob Boot Retainer Adapter, highlighting the external shape designed to interface with a shift boot.
3. Operation
The uxcell Gear Shift Knob Boot Retainer Adapter functions passively once installed. Its purpose is to maintain the position of the shift boot relative to the shift knob, preventing the boot from sagging or exposing the shift lever mechanism. No active operation is required from the user after installation.
4. Maintenance
This product requires minimal maintenance. Periodically inspect the retainer for secure fitment. If it becomes loose, gently retighten it. Clean the retainer with a soft, damp cloth as needed to remove dust or grime. Avoid using harsh chemicals or abrasive materials that could damage the finish.
5. Troubleshooting
- Retainer does not thread onto the shift lever: Verify that your shift lever has an M12 x 1.25mm thread. If the thread size is different, this retainer is not compatible. Do not force the retainer, as this can damage the threads on both the retainer and the shift lever.
- Retainer does not sit flush with the shift boot: Ensure the shift boot is properly positioned and not obstructed. Check for any debris preventing a flush fit.
- Shift knob does not thread over the retainer: Confirm that your shift knob is compatible with the M12 x 1.25mm thread and that the retainer is fully seated.
6. Specifications
| Feature | Specification |
|---|---|
| Product Name | Gear Shift Knob Retainer |
| Brand | uxcell |
| Model Number | a18052500ux0425 |
| Material | Metal |
| Color | Blue |
| Thread Diameter | M12 x 1.25mm |
| Hole Thread Diameter | 10.7mm / 0.42" |
| Adapt Hole Diameter | 15mm / 0.59" |
| Dimension (L*D) | 42 x 34mm / 1.65" x 1.34" |
| Item Weight | 1.38 ounces |
| Included Components | 1 x Gear Shift Knob Retainer |
7. Warranty and Support
Specific warranty information for this product is not provided in the available documentation. For warranty claims, technical support, or further inquiries, please contact the manufacturer, uxcell, directly through their official channels or the retailer from whom the product was purchased.