Methods of forming a T-shaped SBD using a single-mask process flow are disclosed. One method monitors a telephone call for a call screening request for commercial, residential, and other identifiers of incoming calls. Securities transaction or orders from non-member institutions are then transmitted from the non-member institution to the credit authorization service of the exchange. With such configuration of the engine, the effect on various components around the pump can be reduced, while downsizing the oil pump and the engine.