This is a jig for cleaning and water-breaking-in of Mini 4WD motors. It was created with the aim of effectively utilizing leftover Mini 4WD parts. Designed to fit Tamiya spare bottle 46. By setting the motor and shaft, and applying electricity to the terminals on the top of the lid, it is possible to rotate the motor inside the bottle. It can be used to reduce motor noise and prevent water splashing. The lid is a screw-on type. Due to being 3D printed, there may be some surface roughness. Please be aware of this. -What you will need- Nut (2mm nut included with Mini 4WD) * 16mm screw (length including threads) * Tamiya spare bottle 46 Shaft (60mm shaft included with Mini 4WD) Motor * Can be used without these, but use them as an aid if the parts are loose. -Caution- This product alone cannot perform the breaking-in process; a separate motor breaking-in machine with alligator clip specifications is required. If the motor temperature rises, use it while cooling it. The bottle, motor, shaft, and nuts are not included. When using, be sure not to leave it unattended, and handle it with care. To prevent accidents and troubles, please refrain from using it unattended. Shipping is planned via Yu-packet Post Mini. -Additional Information- No price reduction. Thank you.