Interrupter (cross) brake lever cable guide wedges?
When I wrenched for a cross team we just taped over the housing. We also would position the levers further out (unless you're running narrow bars.) Keep in mind there's no need to pull the tape so tight that it would bend the cable housing. You want to pull the tape just snug enough so it doesn't slip. If you get to the end of the bar and let go of the tape it shouldn't unravel. If it does you likely pulled it too tight. Also no need to use so much electrical tape at the end. If you want a really clean look cut end of the tape at a 45 degree angle so it lies flat when you finish wrapping and hold it in place with a dot of superglue.