f90x wrote:
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And yes, a larger 'drum' would increase the weight of the pull, However within the relatively small area of a twist grip and the extra girth of the grip puppies the extra weight of the movement is unoticeable.
Mmmm. Now that is interesting. You've just described a free lunch!
There can't be any doubt that an increase in grip diameter will make the throttle feel "easier" to turn. Easier as in effort, not necessarily as in "awkwardness". But along with that increase in mechanical advantage must go an increase in the length of travel. It has to!
Ok, the increase in travel isn't at the cable now, but it definitely is at the circumference of the grip. The angular movement hasn't changed, but the distance moved through space by the wrist joint will increase. So you have, effectively, increased the travel.
The fast action cable mechanism decreases travel and decreases mechanical advantage. A larger diameter grip increases mechanical advantage again, but it must increase travel again.
Can't see any other way of reconciling what you have, with Newton (or was it Galileo?).
End o the day, hey, if it feels good do it!