inputs.text: must rc enthusiast using linear servos - big fan horizon hobby umx eflite planes micro blade helis lot people complain linear servos use umx stuff admit fail sensor behind linear screw becoming dirty someone rc groups mentioned faderlube local guys surprised not know got can5 oz thought would flight small like less 12 second shot linear screw area preflight servo tests tests helps move lube around honest not know lube helping not linear servo fail month fly umx planes helis hours time days weeks looking bearing oil using liquid bearing amazon year