As remember its a problem with bobbins to old projects, especially if u want buy small quantity. I saw Moby have bobbins to u47, but he dont want to sell them, ...so i figure out to make them from PCB, China do this very cheap...Only are imagination can blosk us...
https://groupdiy.com/threads/how-to-make-transformer-bobins.84970/
https://groupdiy.com/threads/how-to-make-transformer-bobins.84970/
