Lads: O.K. I´ve made hundreds of PI coils. I have shells for 9" In 4m/m high impact poliestirene white colour in two pieces. There are two methods for joining them, Allows 20 m/m basket winding, spiral winding and bundle winding. Also have one piece same material eliptic shell 11" x 5" for bundle winding. These are best. Sell them for around US $ 12. the standard(round one) and US $ 10 the eliptic. Each. No freight included. Both are vacumm formed and look damm good . If anyone is interested please ask for photos at [email protected] By the way I am Richard karslake G