I think the steel handlebar slot/aluminum slide/steel internal twist channeled throttle design makes it hard to get a good snap throttle return, especially after 45+years.
You may want to clean the inside of the throttle tube and lightly break the edges of the new slide.
Frankly, I have never been successful at getting this type of throttle to return by itself, even using specialty lubricants. Maybe some members can shine a better light on this issue.
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