Abstract: A fastener for securely attaching a board perpendicularly to an edge of a composite board that includes a first portion and a second portion. The first portion includes a dowel that fixedly engages in a blindbore in the edge of the composite board, a washer that removably abuts against the dowel and the edge of the composite board and limits travel of the dowel in the blindbore, glue that is disposed on the dowel and in the blindbore and fixedly engages the dowel in the blindbore, and an installation screw that extends through the washer and threadably into the dowel, and when tightened, holds the first portion together as a unit, while the unit is being installed in the blindbore, and once the unit is installed, the installation screw and the washer are removed, with the glue maintaining the first portion in the blindbore.