Blew $65 on a borescope for my prebuy that turned into the most useful $65 I ever spent

Olivia White · 2026-09-18T02:05:03.224133+00:00

I bought a cheap $65 USB borescope on Amazon mostly to check cylinder walls on a Lycoming O-320 for a prebuy last year in Wichita. The deal fell apart over a bad exhaust valve, but three weeks later that same scope helped me find a cracked spar in a customer's Cherokee that saved him around $12k in a potential in-flight failure. What cheap tool did you buy for one job and end up using way more than you planned?

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Blew $65 on a borescope for my prebuy that turned into the most useful $65 I ever spent | Aircraft Mechanics - Vivisector