Abstract: A tool for the installation and removal of an elongated member such as a spark plug, with threads extending from an end through at least a part of the length of the member, takes the form of a tube, open at both ends, made of stiffly resilient expansible material, and a liner in the tube, fixed against movement relative to the tube. The liner is made of a compressible resilient material and has an axially extending passage, opening at both ends of the tube. The passage is defined by a cylindrical wall of the compressibly resilient material and is of a transverse cross-sectional size to permit insertion of the elongated member against the compressive bias of the liner, but to grip the elongated member when it is inserted to inhibit relative rotary motion of the elongated member and tube. The material of which the tube is made is sufficiently resilient to expand when the elongated member is forced into the liner passage, but stiff enough to maintain the passage substantially straight.