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The custom elbow joint I made for my ROTF Megatron fell irreparably apart at the rotation point. It was kinda just a placeholder anyway, the hinge's weak ratcheting couldn't adequately deal with the weight of the forearm. So I was wondering two things.
1. What would be a good source for a ratchet joint for this particular job (must be no wider than 9mm)?
2. What's a good source for ratchets for Transformers customs in general?

Your only real option is Revoltech joints, which are basically universal joints (peg at either end with a ratcheting hinge).

Thanks for the tip! I was expecting you to just tell me to get the UFO arm, but that was actually very helpful advice!