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They do heat up after 3-10 minutes, but if your quick about your degauss, or do it a bit at a time turning it off in between it should be fine. I made one out of one from a 36" set there was enough diameter to wind it into a three loop 15" coil (like my purpose built unit which it is a backup for). As long as you don't plug it in and walk away for half an hour nothing bad is likely to happen.
All I did was add a cord and loop up the tape wrapped coil into a smaller diameter coil consisting of three loops of the bigger one, then give the thing another layer of tape to make it keep that shape...It was easy.
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