Abstract: A portable davit mounting assembly and method for removable attachment to a rooftop pedestal and mounting plate. The portable davit base adaptor assembly is inserted into a mounting plate of a fixed davit pedestal and is secured with pins. The portable davit base adaptor assembly includes two opposed side plates and two metal transverse supporting members. The opposed side plates have apertures for inserting davit supporting pins and interlocking feet for inserting into mounting plate apertures. The transverse supporting members have holes for inserting pins to secure them to the pedestal mounting plate. The rooftop pedestal and mounting plate can be installed flush to the rooftop. A davit arm is rigidly attached to the portable davit base adaptor assembly for use in suspending scaffolding over the side of a building.