Abstract: A spindle mounted accessory holder block is fixed to extend across the nose of the tool machine at a spaced location from the main bore of the rotatable spindle in which the main operating device is positioned. The block has an outer face with a plurality of seats defined therein each being spaced at a specific radial distance from the main bore and each providing a mounting for a pin holder of an accessory mechanism. For this purpose the block is provided with two or more inwardly extending seats each having holes therein forming passages providing the connection for a medium associated with the accessory, for example, compressed air or similar fluid. The holes in the seats of the block provide means for mounting a pin or pipe connection for the accessory which may be positioned at a spaced radial location from the main operating mechanism by mounting it in a selective hole of the block.