WOOHOO! Good weather = time to build

[P5se Camelback]

... cut a gap in the rail, and slide a plastic "bread clip" in the gap. You know, those plastic clips that the bread manufacturers use to close the plastic bags that they package loaves of bread in. Dribble some gap filling acc on each side of the bread clip and let it set up. Trim the top and sides of the clip and use a riffler file or #11 Exacto blade to remove the plastic sticking out from the web of the rail to imitate the profile of the rails. You may want to clean up the top of the clip with a bit of 400 wet or dry sand paper to blend and smooth the gap into the rail. You rail gap will virtually disappear, but the plastic filler will keep it from closing up and causing a short.

Whoa! Russ! Awesome thought there! I had been wasting money, using leftover scraps of 0.010" or 0.020" styrene and essentially doing what you describe, initially because I couldn't deal with the aesthetic of the commercial plastic insulator rail joiners ... but the bread bag clips ... brilliant! and just one more thing to drive my daughter's mother crazy about the things I collect when my daughter stops by with my grandson for a quick visit and has her mother with her. I think the reason I can't find any of my two dozen 3/4 oz. airbrush jars is because when I went ahead to a new job and she stayed behind to pack, I think she considered them "more of Bil's pack rat collecting obsession" and threw them out, along with the small 1 pound coffee tins with the Woodland Scenics ground foam in them.

But I do like the bread bag clip dealie as an insulator! It's brilliant!