The same goal as airport security - find and remove hazardous metal. Old nails break during removal, with tips of iron remaining lodged within these 1" x 4" boards.

Here, Kalimba chisels out the surrounding wood to expose the lodged nail.

Removing the exposed sub-surface nails with the Crescent nail puller, a long standing tool of the trade. The boards hope to be re-used as part of the 158 Clifton Pl. Passive House project.