I would like to second the rule change submitted by Fos for the production classes.
Throttle control assembly may be replaced with parts of unlimited origin.
*The stock throttle assemblies are not well made and don't hold up well with racing abuse, replacement assemblies are expensive and I don't like the idea of trying to glue on a zip tie. A quick turn throttle assembly will not make a huge difference in performance, but it will add reliability and adjust-ability at a reasonable cost. They will also survive the impact of a crash much better.
Ian