Demagnetiser is very helpful to remove magnetic field from tools ,like for instance it will make your work simple when you are cutting leads of electronic components as they less likely stick to demagnetised tools.
watch video here
Step 1: You Will Need !
remove all the magnetic core plates from transformer , take your time and remove all plates without damaging the transformer coil
Now install all of the E shaped core plates back into the coil ,you can use some kind of glues to hold the plates (it will reduce 50-60Hz humming noise)
make sure coil is okay ,with your multimeter and it's time to plug it in.
Step 2: Safety First!
You should connect an electric bulb in series with the transformer coil.
Step 3: Swipe It Over!
DON'T PUT TOOLS TOO NEAR TO COIL ,THEY WILL ATTRACTTED HARDLY BY MAGNETIC FORCE AND CAN DAMAGE OR CAUSE SHORT CIRCUIT IN COIL.
Step 4: Before and After
Step 5: Watch the Video
Thanks for watching subscribe for more stuff like this ,stay creative!