Apparatus for controlling the excitation current of a variable frequency generator including means to create a voltage-regulated DC link using PMG power and frequency information, the latter being the image of the VFG mechanical input speed. The holder includes a support that is pivotable on a side wall of a pigeon hole so that by swiveling of the support, a receiving area for placement of the drink container is separable from the remainder of the pigeon hole. The upper surface and the lower surface of the lower ring have thick and thin subportions to increase the flexibility of the lower ring. The design attribute or the connectivity model or information is updated upon the identification of changes to provide the latest information or data for properly closing a design.