An attachment I made for 4" air coils, which makes it eaiser to remove the coils without having to remove the whole attachment to retrieve the coil. One could also make removable center section's (the plywood) of different diameters and thickness to suit your needs. In case you missed them, heres a couple more videos. watch the Home-made coil winder video (part 1 of 3) http://www.youtube.com/watch?v=g7Sm8XAeUGk coil winder (part 2 of 3) http://www.youtube.com/watch?v=mZy85s4gzco