I use a short tree lopper sorta tool.
Its actually a proper copper cable cutter.
The ends of the jaws lap over each other and are only 3 inches long.
I set the open end of the jaws into and nder the wire where it lifts of the ferrite and squeeze.
It breaks the ferrite and nothing bluntens sharp jaws like crushed ferrite..
But it cuts thru the vopper in two munches and then IT peel tge copper off.
Where there's glue, I peel off the loose clean wire and use tinsnips to cut around it.
By then most of the clean copper is off a.d the contaminated stuff is small and I put it in with the plastic coated wire.
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