There are ways to go thru the ribs and not cut any of the wing.
See N64KR at <http://krbuilder.org/> http://KRBuilder.org - Then click on the pics 2015 KR Gathering - McMinnville, OR. September 3 - 6 -- See U There. Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN Daniel R. Heath - Lexington, SC -----Original Message----- I am going to be cutting a thin line in the wing so I can lay electrical cable to the position lights and strobes at the tips of the wings. The person I bought the aircraft from didn't run any electrical through the wings, so I'm thinking of using a dermal to cut a narrow deep line so I can lay the cord without having to dig through the spar and what not. Then I plan on filling in the hole with foam and re-applying fiberglass. It was suggested that instead of placing it on the leading edge, that I place the cut under the wing.