Original Welding Needles For MinderRC BifRC DH20 DH30 DH30 MAX Spot Welding Pen SWP-092PCS welding pin and 2PCS fixed base sold togetherHow to change the welding Needles:Step1: Use pliers to pull out the welding pin and the fixed baseStep2: Use pliers to deform the end of the welding pin at the bottom so that the base can ne well fixedStep3: Put the welding pin and fixed base into the welding pen