Oil for bearings?
#4

I'm not a "rc helicopter" specialist, however I am a CNC programmer/machinist. I totally think spindle oil or "sewing machine oil" as you call it would be an excellent choice. it's an extremely light hydraulic oil and would use it on my helicopters.
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flydawg (11-20-2021)
#6

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flydawg (11-21-2021)