Binocular choke extras

I've just taken delivery of a couple of ferrite 'binocular' choke cores;
each one came with two thinwalled metal tubes and some bits of printed
circuit board.  The tubes appear to go through the holes in the choke
and the holes in the boards fit over the ends of the tubes, with copper
areas that could possibly be soldered to them.

Does anyone know what purpose these serve?


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~ Liz Tuddenham ~
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www.poppyrecords.co.uk