One technique that I have used occasionally has not been mentioned yet. Assuming the the core has a hex hole in it, you choose an metal hex key (allan wrench) of the right size to fit the core and heat it very hot with a torch. Then place the key in the core and let the heat transfer to the core. After a few minutes, very carefully and gently try to turn the core. If it turns, then remove the metal key and use the normal plastic tool to remove it. If that does not free it, then try something else. If it is already cracked, the metal key with slip in the core in which case drill it out or replace the whole coil.
Burt VE2BMQ>>> Eric Lemmon wrote: > > > > Since many coil forms have a waxy surface, it often helps to direct a flow > of very warm air around the form while applying slight torque with the > proper tuning tool. I made an adapter nozzle for my Weller heat gun that > allows me to direct the hot air to a small area, without heating adjacent > components. This usually works, but I then must use a wire brush to clean > the threads of the core, which now have melted wax in them. > > 73, Eric Lemmon WB6FLY >
