Abstract: Improved soft top assemblies, systems, and methods to cover an open space above the driver and passenger seats of an automobile provide or use precision molded frame elements with interconnecting fastening assemblies to support a soft top cover attached to forward and rearward frame elements. A centrally hinged and pivoting stabilizing bar fitted within frame side elements maintains support and stability to the soft top cover. Forward and rearward frame elements provide mating surfaces matching existing OEM attachment points for a removable fitted hard top for the automobile. Each frame side element underside includes a channel sized to receive a corresponding closed automobile door windshield.

Abstract: An improved method and apparatus for making cast dental models having integral dowel pins permitting segments or dies of a model to be attached and re-attached to a base plate in a precise location, by means of holes in the base plate adapted to insertably receive the dowel pins, is disclosed. The apparatus includes a base plate having a generally semi-circular shape, the arcuate outer wall surface of which is modified to have flat walls approximating the shape of a circumscribed polygon. A matrix positioning plate has a polygonal aperture through its thickness dimension adapted to insertably receive the base plate. A negative dental impression is attached to a first, lower surface of the matrix plate, and a transparent transfer plate of the same size and shape as the base plate inserted into the aperture of the matrix plate. Marks are placed at those locations of the transfer plate where dowel pins are desired to engage parts of the dental impression viewed through the transfer plate.