Here are a couple of SF blade plugs that I have modified. I wound copper wire through the holes and drilled out the center and added an insert from a compression fitting, which to my benefit come in silver and brass finishes. I wasn't sure how the copper wire would look in the brass plug in terms of clashing, too much shiny? I think they both turned out decent for a 2nd and 3rd attempt at it.
Plugs are showcased in champion tier hilts from the SF Customs division. A 12w+ Red Mauler and a 12w+ Deep Blue Vigilant.
Even though you want to; don't look directly right at it…