I use the inside cable from an old speedometer cable it "snakes" as well as the little auger but it is more gentle, point wise. I don't recall but I think it was from an early Chevy. Just pull the center cable out of the housing. BTW
it works great for pulling wire through places that need to be "snaked" through.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson