wrote:
/snip/

Standard Unison/Slick harnesses are inexpensive and relatively easy to
repair, you can usually shorten them a couple times before poking in a
replacement lead. The silicone coating will gradually abrade and get a
little funky looking. Downside is they don't like the heat, and unless
they've changed the plug nut from the aluminium I'm familiar with, the
nuts will gall if you try to force them onto a boogered or corroded
sparkplug. Poking on a new nut on is fairly simple.

Have also used Bendix/TCM harnesses. They are pretty much mandatory on
turbo installs (w/90 degree elbows) depending on the wire routing so
you can keep them away from the exhaust stacks. They hold up a lot
longer, are a little tougher to repair/poke in a new lead. Cad-plated
steel nuts won't gall on funky plugs.
/snip/

I have also replaced many sets on various aircraft over the years, and I
agree the TCM harnesses are very well made. I also really like the
Champion sets: They, too, have plated steel "B" nuts, offer 90 degree
ends on any application (makes for a neater installation, usually), and
have a very durable rubber wire coating. I've never seen a set break
down under normal use and care. Prices are reasonable, as well.

Happy Flying!
Scott Skylane
N92054