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Driven by a single 18650 battery, reverse battery protection and short circuit protection are also built in for safety use.
Choose the winding rod what you need.
Install the winding rod as the picture step 2, and choose the same diameter winding cover.
Use the resistance wire through the hole to wind the coil wire.
The coils are according to the resiatance which you need.Generally wind 4 to 7 coils.(PS: The resiatance depends on the length,thickness and material of the resisatance wire)