Has anyone tried the Visual Optics video borescope?
14mm spark plug or O2 sensor hole, and also gearbox drain ports etc. The Ridgid SeeSnake was a possibility, (for about the same price), but it's .7" diameter is a bit too large. Also the lower cost fiber scopes are a possibility, but in this price range the highest fiber count I saw was 7000 fibers, which on the face of it seems lower than the pixtel count on the Visual Optics, plus they are typically only
18" long vs. 36" for the VO. Also the VO has a built in color screen plus video out jack.