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Mike, I bought an endoscope and I'm amazed by how much helpful it can be. First use is of course when you want to check the valves and piston heads following a "moment of enthousiasm", aka overrevving. They go for cheap now, mine is a Depstech, small diameter with leds surrounding the camera. Just have to load the ap, connect it to your smartphone and be aware of what's going on in any hiden and dark place.
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