A method and apparatus for temporarily attaching a power driven tool to a surface, such as a concrete wall, for drilling, milling, sawing or grinding of the surface, includes a rigid suction bell. A tool holding device is mounted on the outside of the bell in a position to enable a tool held thereby to engage the surface outside of the rim of the bell. The rim of the bell is provided with an elastic seal, and at least three preferably adjustable legs are provided on the bell to space the rim of the bell from the supporting surface, thereby limiting the deformation of the elastic sealing ring. The suction bell is adapted to be connected to a vacuum source, preferably for continuous evacuation during a machining operation on the surface.