I had already pulled lengths of Van’s corrugated black conduit through the wings, but hadn’t bothered to permanently attach them. Didn’t have anything else to do today, so I mixed up some proseal and made the conduit installation permanent.

Prosealed conduit

I also caught up on one smaill detail. I had previously installed local ground studs in each wingtip for the landing and nav lights, and had used steel AN hardware to make those studs. I had a sneaking suspicion that galvanic corrosion could result from running electrical current through steel fittings in contact with aluminum, and after some digging in AC43.14, I found that was indeed the case. I ordered some special aluminum washers from GAHCo and reworked the grounds so that only those washers are in contact with wing structure. Problem solved.