Talking borescopes, my quite expensive Vividia VA-880 dissolved its lenses lately when it got attracted to a small pool of fuel left in the tank I was inspecting… doh.
Replacement is this VEVOR Articulating Borescope. The price value ratio is IMHO excellent.
PS
It’s 6.4mm head makes it perfect for checking on those eventual cracks in the RVs HS 
As a pretty monogamic forum crawler I have no idea whether it is ethical or whether I will get sued or whatever bad may come from cross-posting things from another forum but maybe this can be of value: https://www.rotax-owner.com/en/general-tech-discussion/10220-recommended-borescope
