On each antenna wire there are several insulators in a row. While there have been many different attempts to create the best looking insulators using brass, beads, etc., I find the best pieces are the OEM plastic insulators included in the kit. These are, of course, molded together in groups of 2 or 3 and must be cut apart and modified. TRY not to let these lil blighters go flinging into your shag rug... chances are you'll never find them again!
After you cut apart the insulator group, cut off any additional "rings" or "eyelets" that are molded onto an individual insulator. (HINT: on insultor groups, the end insulators have eyelets). What you want to end up with is the most basic insulator "bead". Revell has already molded lengthwise grooves on 2 opposing sides of the insulator, so all you have to do is cut/file 2 more lengthwise grooves on the perpendicular sides. When finished, you'll have an insulator with 4 lengthwise grooves at 90