i went to the local farm supply store and got ceramic insulators for rigging electric fences. They are about 1.5 in dia with a grove in the side to hold the cables. They seemed to have an effect in cleaning up the high end some as i remember. I doubt they are more than $5 or$10 a dozen. Haven't used them for years since the twins discovered they made decent projectiles.
cleaning up cord runs is very helpful.
cleaning up cord runs is very helpful.