Helping Hand (sturdy)

Sturdy Helping Hand Most of the helping hands (soldering arm) use ball joints. They do provide high DOF and is easy to use / make. However, since the rigidity of the arm relies on the elasticity of the material, the reliability tends to decrease rapidly. In other word, helping hand with ball joints cannot be sturdy/reliable enough. Therefore, I introduce you a sturdy version of helping hand. Features : sturdy, reliable armcan adjust stiffness of the arm by adjusting the bolts of the jointscan manipulate arm's DOF by constructing the arm however you want thanks to the modular designunlike other 3D printed alligator clips, the hand part (“Spring Clip”) seals tight with almost no gap. therefore can hold thin wire without any problem“Spring Clip” has a replaceable spring, therefore can replace it whenever the elasticity is lost“Spring Clip” also provides various springs for different grip force. User Guide : 1. ArmThere are 2 types of arm part. One with parallel two holes (i.e. arm_par