[csx4017]

Have used Boroscopes in aviation for years with the smallest heads you've ever seen. When a mechanic tells us he/she was working in the cockpit and just failed his/her tool box inspection.....Guess what NDI gets used......When a wire harness, that is buried in the wing or fuel cell, doesn't check out, we go in with the little beauty. I am a believer !! My old Roush heads were Boroscoped through the spark plug bores and through the intake manifold and info'd back to Roush..............Think I just need a light and telescoping inspection mirror to spy the plug......If its there and I cannot touch it, then it is Academic.......Good to hear that an inspection and test will be done on your failed parts. That way when mine fail we can compare Rockwell readings.........Good luck on fab and install.