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I bought 4 transformers recently and when they were unpacked, one of them had a slight rattle. In other words, there is a little play between the windings and the core. The windings move about 1/32", maybe a little more. The other 3 are rock solid, no movement.So I'm wondering if I should buy another transformer or just jam something on one side of the windings and eliminate the possibility of movement. These transformers weigh 5 lbs. each, so there is no point in shipping it back. That would cost more than the transformer (cheap because it's surplus stock).
Follow Ups:
Careful, depending how well it was packed for shipping the thin insulating material over the outer winding near the iron core may have chafed away enough to bare the winding conductor. There is also the possibility the winding will chafe against the core after being energized for a period of time. Call the seller who sold it to you.
It seemed to be okay, but now I will check it carefully.
The loose windings are not going to effect electrical performance.If it hums too loud for you then you could always tap a wooden shim between the winding and core to quiet it down.
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