A spot drilling tool includes a drill holder and an insert removably mounted to the holder. The rim is held in a generally horizontal position in which the laundry bag is open, but may be lowered to take up less space. The joint main body 20 is formed of a first resin material weldable to the wall of the fuel tank FT, and the barrier layer 30 is formed of a second resin material that is adhesively and chemically reactive with the first resin material and that is more fuel-impermeable than the first resin material.