Ps: i do not like where that spring is attached.
From the photo it seems like it is hooked around the bolt holding the heim joint, the hook of the spring could get hung up on the linkage or perhaps the side of the joint itself.
Springs should have dedicated mounting points, not just be hap hazardly hooked onto any seemingly convenient bolt or piece of metal.
This type of thing is the cause of many "sticky" throttles.
The Devil is in the detail.
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