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True, and some do. I had several aluminum arms back in the day that I'd replace the plastic ones with. Now the higher end motors come with slide carbs and completely different setup. Much better if you ask me. I hated those barrel carbs. @trucked Take that arm back off. Look at the end of the...

Cost, I suppose. Been done like that for years on the cheaper motors. If set up correctly, not much torque on it.

Yes. Usually with a half moon cut out. He said it was new. But, it usually happens from the motor getting too hot. I've seen them loosen up and strip too. If he gets a new one, install it and move it by hand before connecting the servo. Just to make sure something else isn't binding. It doesn't...

That's what I said from the get go. You can clearly see the nut doesn't move several times. Either stripped or needs a washer to clamp it tighter. Seen it happen numerous times.

Sounds like the plastic arm is stripped. Or loose. Remove it and inspect it. There should be some sort of pattern inside. Half moon or something. If it's rounded out, it's stripped. If the motor got too hot it could have melted it. Replace it or find a way to get it to grab.