HIGH CAPACITANCE FERRITE TRANSFORMER FOR HIGH VOLTAGE USE

I have been trying to rewind the ferrite transformer for DIY project but failed. Maybe there is something I am missing something that I dont know. I tried using a flyback for TV for many of projects but its lifetime is limited and its too BIG, it burns out. My projects was; transformer for stungun, tesla coil and audio transformer. 

The ready made transformer measured high reading on my multimeter e.g. 1565 but when I rewind them even if they having many turns they reading too low e.g. 82