I tried everything including what @JDinNFLA recommended and gave up and bought this device which does work: https://smile.amazon.com/gp/aw/d/B08C9ZQFR2?psc=1&ref=ppx_pop_mob_b_asin_title
Depends on the thickness of the insulation. There are two tools, one goes up to 1/4" (0.250) O.D. diameter wire and the other goes up to 3/8" (0.375) O.D. diameter wire.
Looks great, thanks for the tip @UNIKRN150 !
This looks like a seriously well made solution! Have you used it? Does it work by sliding that “ganging assembly” left and right? (I don’t know how else to describe it)