As suitable weaving materials were difficult to find in post-war Australia, Ervins designed this unplying machine, whilst staying in Parkes Holding Centre in New South Wales in 1950. Made from cans, scrap metal and wood, he used the machine to unply balls of wool to make weaving threads for Anna. A qualified engineer, Ervins was actively involved in helping Anna with her craft and designed other weaving devices for her to use.