The fly swatter transfor needs a rewind. Charlie helped me with mine and if you soak it in laquer thinner it will basically fall apart. Then you can rewind to specs. The reason I am using this is that I found you have to buy a large quantity. I bought 12 around $1.50 on sale. I let the lady know if she has any more with broken strands I would buy them also.
I am also winding a toridal transformer which is fairly small and the core I am using is comparable to Digikey pt. P12722-ND. They are 5.70 Can. for 10. I think these would be better as I am finding the ears on the swatter transformers break very easily. Wind your wire on a shuttle and sit down and watch your favorite sport and when it is over you have one made. Also if needed you can pack on the extra turns.
John