[not done by me!]
the main link http://www.audiohobbyist.com/projects/diyopt.htm
how he has done
>he has all the the data on the man trafor tobe cloned
>gets a Ccore and prepares coils in a winder
>each layer is given wax paper
>finally full unit is heated with a bulb to remove moisture fully
I can provide some needed items of someone willing to get coppers and take part
i have
*c.cores
*LC meter (diy)
*temperature controller circuit for final heating
need to make a Winder (read a mini drill with counter)