A method includes loading a longitudinal member comprising holes located at distal ends of the longitudinal member into a holder, the holder comprising a tip end comprising a first portion and a second portion, wherein any of the first portion and the second portion comprise a prong tip； a handle end located distally away from the tip end, wherein the handle end comprises a first gripping arm and a second gripping arm； and an engaging member operatively connecting the first gripping arm to the second gripping arm, wherein the engaging member comprises tooth-like features. The method further comprises engaging the tooth-like features of the engaging member with the second gripping arm； and fitting the prong tip of any of the first and second portions of the tip end of the holder into a hole of the longitudinal member.
