The invention relates to a method and apparatus to carry out the method for extracting petroleum distillate products from alcohol. When the handle is pivotally turned to axially move the braking block in the outer sleeve with the screw rod engaged with a threaded section on the round hole of the braking block, the keyboard carrier is stably supported by the screw rod without the risk of moving. Each of a plurality of carriage rails extends transversely along the framework and has first and second carriage mounts slideably disposed thereon. The server also receives customer information from a customer including a productservice that the customer wishes to purchase along with a minimum discount that the customer desires for the productservice.