I actually cried today when my dear old dad handed me the digital microscope dvr .
I have poor eyesight and struggle with inspecting the boards and even reading the silk screening .
this thing is awesome and cheep .
I will also post how i make my own corrective lenses for goggles when my new skyzones show if anyone is interested
No 5s pax yet.
Crashed and broke a shaft.
The consistant granular nature of the fracture face indicates instentacious catastraufic stress failure.
No indication of prior cracking or fatigue stresses.
Hardness measurement and metalurgical analisys is beyond my resources also the scope is not strong enough to detremine the grain structure of the fractured surface .but the distortion of the shaft where in contact with the bearing shell indicates some form of heat treatment to reduce the brittleness of the carbon steel shaft (grade if alloy unknown but is highly magnetic)