Panasonic N210076717AA 3-Head Holder Helical Spring for CM402 SMT Mounter The N210076717AA 3-Head Holder Helical Spring is a precision mechanical replacement component used in the holder assembly of Panasonic CM402 SMT placement equipment. Available parts references identify N210076717AA as a spring associated with the CM402 H3 or 3-head holder mechanism. During normal SMT production, the placement head performs continuous repetitive movement at high speed. Small mechanical