A novel driver circuit that uses a differential driver as a design backbone is described. An example system may include a wager management engine configured to create an account for a third-party host of entertainment content, the account including third-party host-specified wager parameters associated with the hosted content. Thanks to these storing and tracing capabilities, the method addresses the selection of appropriate and reliable recipes while designing new process flows, thus favoring the definition of highly reliable new processes. Each key pod further includes a set of data input keys correspond to the fingers of the user’s hand and a thumb key. The coupling mechanism includes a pivot for rotatably supporting the reservoir and a supporting member for supporting the pivot so that the pivot can be movable in an upper and lower direction of the fuel tank relative to the tank cover.