The Solderless Breadboard Neighbor for GreatFET (also known as Daffodil) provides a solderless breadboard plus a small solderable breadboard area for through-hole prototyping. Daffodil is designed for the Parallax 700-00012 solderless breadboard. The breadboard has an adhesive pad on the bottom that can be stuck onto Daffodil. There is no electrical connection through the bottom of the breadboard. Daffodil wiki page.