Holder for lead insert and needle for a compass

摘要

An improved compass leg provided with a lower leg portion having an elongated cavity in which a pin or lead insert holder is received and secured by means of a threaded shaft attached to the holder and passing through an aperture in the lower leg portion and engaging a nut; the holder is provided with an axial hole to receive a substantial portion of the pin or lead insert and a groove which communicates with the axial hole such that tightening of the nut causes compression of the sides of the holder and maintains the pin or lead insert securely within the holder.