Abstract: A method and apparatus are disclosed for installation of a cassette system for enclosing window coverings hardware, such as roller shade systems and to permit convenient removal of a roller tube assembly from the cassette without the need to take down the cassette itself. A cassette box is provided with two tapered slots at the wall side that match with two tapered cantilevers of the installation brackets. Installation of the cassette box is accomplished by simply lifting the box with its slots onto the bracket. Brackets are available as wall mount brackets, as ceiling mount brackets, and as end brackets for inside mount. The wall and ceiling mount brackets feature tapered cantilevers that precisely match the tapered slots in the cassette box. The tapered shape ensures that the cassette box locks itself firmly into position and tightens itself towards the bracket. The wall brackets include a flat aluminum plate and a carrier flange that is provided with the tapered cantilevers.