Man it always seemed to me that the winding of coils, inductance and reactance , the pearmabilty of cores ect is pure voodoo magic. The way someone comes up with taking "x" guage of some sort of enamaled wire and winding "#" around such type of alloy core in a particular pattern with such and such interleaves per so many windings using the skin of some peculiar exotic south Asian eel works out to be the value for whatever application or by changing the core spacing and utilizing a Teflon coated secondary wire material and rewinding it 29 turns forward during the month of Febuary only on a leap year will give you exactly so many more micro henries as to do yourself justice! MY HAT IS OFF AND I BOW DOWN TO THOSE OF YOU WHO MASTERED THESE BLACK ARTS AND/OR THOSE WITH ENOUGH PAITENCE AND DILIGENCE TO ACTUALLY AND ACCURATELY UNWIND AND COUNT AND UNWIND MORE SO PERFECTLY TO MAKE IT ALL GO TOGETHER AND WORK AGAIN PERFECTLY! Good grief! What do you do when the unthinkable occurs and you lose count??? !!!! Seriously! Transformer rewinding seems absolutely amazing and I totally applaud those that successfully complete it and pity the fools like me who might attempt it. I am pretty fearless when taking things apart, usually able to put most back together but unwind bobbins of wire ??? No thank you! Not without a Elmer present to hold me in her arms!