Servos are pretty much maintenance free. They work or they don't. I had one crap out on the lower starboard stern plane on my Columbia at Subfest but it was most likely because I did not get enough CorrosionX in it. At that time I had been using the aerosol HD stuff and it is more challenging to get a servo adequately full because of its outgassing. I use it instead on the motor shafts and bearings.
Brushless motors
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