A push block for a woodworking tool comprises at least heel member at an end of the push block and the heel member is passively actuatable to an extended position to engage a trailing end surface of a work piece to advance the work piece by a working element. The method further includes forming an amorphized region in the substrate adjacent to the NMOS gate structure. The method further includes adjusting an image capture parameter at least partially based on the determined luma value. This joining is useful, for example, in an ordered, oriented assembly of DNA modules to create cloning or expression vectors.