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FWIW, here is an exerpt from a post of several years ago, although it doesn't mention the light blue form:
It's easy to verify that the coil form is mechanically sound by 'wiggling' it briskly. If it's compromized, it'll be obvious and the coil will act like a Slinky.
There were three types coil forms that were not prone to this problem:
1. Brown phenolic
2. Yellow plastic
3. Solid white (opaque) plastic
The one that's always suspect is a whiteish semi-translucent plastic.
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