What’s an “end insulator”?
I use short loops of woven Dacron fishing line, preferably in fluorescent orange so they are harder to misplace. And/or plastic Nite Ize S-Biners. Occasionally the larger #275 paracord. Never 550 paracord for portable work.
I often clip things together (guy lines, support lines, stuff to squid poles like transformers, etc) with stainless steel Nite Ize S-Biners, size #1, sometimes size 0.
I find that size #1 are easier and quicker to operate while still being light and low bulk. Fast setup, even faster bugout. I always pack a few spares.
In the US, Home Depot carries an assortment locally or mail order them from your favorite online vendor.
I also use the Nite Ize plastic Mini CamJams with #275 paracord (fluorescent orange of course) for tensioning ropes and attaching squid poles to various objects.
No association to Nite Ize, just a very happy repeat customer.
BTW Homebrew: 67 feet 24 gauge Tefzel EFHW, 64:1 FT140-43 transformer, 30ish feet LMR195, coax/counterpoise, squid poles, etc.
I sometimes get reports of RF in my audio (band and coax length/position specific). Moving the coax around often solves the issue. 3 turns of coax through a large type 31 clamp-on ferrite solves the problem but adds weight.