The ferrite binocular cores are conductive and can have sharp edges as I
learned the hard way. It is easy to scratch the enamel off wire and cause a
short. What I do instead of using tubing is I coat the inside of the core with
a thin layer of clear finger nail polish called "Hard as Nails" and let it dry
before I put the windings in. Glyptal varnish might work too but it is a bit
thicker.
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